How can I add child node to parent node in xml using Python?

I have XML where I have to add a child node to the parent node using python. I have the XML

<?xml version="1.0" ?><PLMRequest><StyleNumber>20SM1401</StyleNumber><StyleName>PG001 Style</StyleName><Theme>Ocean</Theme><ProductSpecialist>Ashok Gangisetty</ProductSpecialist><Color><ColorCode>0816</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>0044</ColorCode><UserDefinedField1>INF</UserDefinedField1><UserDefinedField2>TH02</UserDefinedField2></Color><Color><ColorCode>0461</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>0430</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>0646</ColorCode><UserDefinedField1>INN</UserDefinedField1><UserDefinedField2>TH02</UserDefinedField2></Color><Color><ColorCode>C801</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>C750</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>0110</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>SK</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>KS</ColorCode><UserDefinedField1/><UserDefinedField1/></Color></PLMRequest>

I want output like

<?xml version="1.0" ?><PLMRequest><Overview><StyleNumber>20SM1401</StyleNumber><StyleName>PG001 Style</StyleName><Theme>Ocean</Theme><ProductSpecialist>Ashok Gangisetty</ProductSpecialist></Overview><ColorInfo><Color><ColorCode>0816</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>0044</ColorCode><UserDefinedField1>INF</UserDefinedField1><UserDefinedField2>TH02</UserDefinedField2></Color><Color><ColorCode>0461</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>0430</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>0646</ColorCode><UserDefinedField1>INN</UserDefinedField1><UserDefinedField2>TH02</UserDefinedField2></Color><Color><ColorCode>C801</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>C750</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>0110</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>SK</ColorCode><UserDefinedField1/><UserDefinedField1/></Color><Color><ColorCode>KS</ColorCode><UserDefinedField1/><UserDefinedField1/></Color></ColorInfo></PLMRequest>

Python code i have used to convert Json to XML

import json
from xml.etree import ElementTree
from xml.etree import cElementTree
import ast
import xml.etree.cElementTree as ET
import xmltodict
import xml.dom.minidom
import xml.etree.ElementTree as DT
class Test(object):
    def __init__(self, data):
        self.__dict__ = json.loads(data)
styleobj =Test(APIsInputData)
styleDto = styleobj.value[0]
root = ET.Element('PLMRequest')
ET.SubElement(root,"StyleNumber").text = styleDto["StyleCode"]
ET.SubElement(root,"StyleName").text = styleDto["Name"]
ET.SubElement(root,"Theme").text = styleDto["Theme"]["Name"]
ET.SubElement(root,"ProductSpecialist").text = styleDto["ProdSpecialist"]["Name"]
for color in styleDto["StyleColorways"]:
    StyleColorways = ET.SubElement(root,"Color")
    ET.SubElement(StyleColorways,"ColorCode").text = color["Code"]
    if color["UserDefinedOne"] is None:
        ET.SubElement(StyleColorways,"UserDefinedField1").text = color["UserDefinedOne"]
    else:
        ET.SubElement(StyleColorways,"UserDefinedField1").text = color["UserDefinedOne"]["Code"]
    if color["UserDefinedTwo"] is None:
        ET.SubElement(StyleColorways,"UserDefinedField1").text = color["UserDefinedOne"]
    else:
        ET.SubElement(StyleColorways,"UserDefinedField2").text = color["UserDefinedTwo"]["Code"]
tree_out = ET.tostring(root, encoding="UTF-8")
newXML = xml.dom.minidom.parseString(tree_out.decode('UTF-8'))
pretty_xml = newXML.toprettyxml()
Outputvalue = pretty_xml

Json file I used

{"@odata.context":"https://prd-euc1.fplm.eu1.inforcloudsuite.com/api/odata/$metadata#STYLE","value":[{"@odata.etag":"W/\"YmluYXJ5J0FBQUFBQUg0RzFNPSc=\"","StyleId":1238,"StyleCode":"20SM1401","Name":"PG001 Style","IsDeleted":0,"StyleColorways":[{"StyleColorwayId":766,"StyleId":1238,"Code":"0816","Name":"Saffron","Description":"Saffron"},{"StyleColorwayId":767,"StyleId":1238,"Code":"0044","Name":"Swan White","Description":"Swan White","UserDefinedOne":{"Id":1,"Code":"INF","Name":"In For","ModifyId":1,"ModifyDate":"2018-07-16T08:54:12.803Z"},"UserDefinedTwo":{"Id":2,"Code":"TH02","Name":"Theme 02","ModifyId":1,"ModifyDate":"2018-07-16T08:55:59.073Z"}},{"StyleColorwayId":768,"StyleId":1238,"Code":"0461","Name":"Pastel Blue","Description":"Pastel Blue"},{"StyleColorwayId":769,"StyleId":1238,"Code":"0430","Name":"Sport Blue","Description":"Sport Blue"},{"StyleColorwayId":770,"StyleId":1238,"Code":"0646","Name":"Light Rose Water ","Description":"Light Rose Water ","UserDefinedOne":{"Id":2,"Code":"INN","Name":"In Next","ModifyId":1,"ModifyDate":"2018-07-16T08:54:39.96Z"},"UserDefinedTwo":{"Id":2,"Code":"TH02","Name":"Theme 02","ModifyId":1,"ModifyDate":"2018-07-16T08:55:59.073Z"}},{"StyleColorwayId":771,"StyleId":1238,"Code":"C801","Name":"Shocking Orange / Navy Blue","Description":"High Visibility Shocking Orange / Navy Blue"},{"StyleColorwayId":772,"StyleId":1238,"Code":"C750","Name":"Flame Red / Black","Description":"High Visibility Flame Red / Black"},{"StyleColorwayId":773,"StyleId":1238,"Code":"0110","Name":"Silver","Description":""},{"StyleColorwayId":781,"StyleId":1238,"Code":"SK","Name":"SK01","Description":""},{"StyleColorwayId":782,"StyleId":1238,"Code":"KS","Name":"KS01","Description":""}],"Theme":{"Id":10,"Code":"OCEAN","Name":"Ocean","ModifyId":1,"ModifyDate":"2020-02-11T10:53:32.333Z"},"ProdSpecialist":{"UserId":34,"UserGuid":"5c302bc2-616e-4943-9baf-323feecfd65c","UserName":"[email protected]","Name":"Ashok Gangisetty","IsActivated":false}}]}