I am trying to duplicate my ID number into another table cell (from ID to ID Digit) onSuccess automatically so I do not have to go in and edit my SharePoint list manually. The screen shot I have here shows where ID = 2776 and ID Digit = 2776 I have manually typed it in.

This is my form that I want to be able to complete this on:

When I click on the checkmark in the top right corner I have it's onSelect property set to:
SubmitForm(NewForm);
On the form I have onSuccess set as below so that a :
//ADD NEW LEAD CREATED ENTRY INTO LEAD_HISTORY SHAREPOINT LIST UPON CREATION OF NEW LEAD
Set(varNewLeadID, NewForm.LastSubmit.ID);
Patch(Lead_History, Defaults(Lead_History), {Title: "", Note: "New Lead Created", HistoryDate: Text( Now(), "[$-en-US]mm/dd/yyyy hh:mm:ss"), AgentCommenting: "", LeadID: varNewLeadID});
So what I was thinking originally that failed, to Patch Lead_Data (the SP list my form Submits to when I click on the checkmark) ID_x0020_Digit : varNewLeadID. So:
Patch(Lead_Data, Defaults(Lead_Data), {ID_x0020_Digit: varNewLeadID});
The outcome was the correct number but in a new record. How do I get it to post to the same record?
Honestly, I am thinking so hard on this that I am guessing that I am overthinking this. Thanks in advance for help!