@Vaibhav_k
You can use the OnSuccess property of the form to do the patch. However you have to have a field in the second list that matches the ID of the current list. So if there is a field in list2 that is ParentID, then
If(IsBlank(LookUp(List2,parentID=Form1.LastSubmit.ID),
Patch(yoursecondlist, Defaults(yoursecondlist),{parentID:Form1.LastSubmit.ID
field1:Form1.LastSubmit.Field1,
field2:Form1.LastSubmit.Field2,...}),
Patch(yoursecondlist,parentID=Form1.LastSubmit.ID,{field1:Form1.LastSubmit.Field1,
field2:Form1.LastSubmit.Field2,...}),