Hi @Anonymous1198 ,
Could you please share more details about your scenario? What are the Mode properties of the two Forms? Based on your description, I suppose they are both New forms, so, after the submission of the two forms, there will be two new accounts in the Accounts table, and also be the choices in account LookUp column. To achieve your need, you can save the account names in a collection, apply below formula in OnSuccess of the two forms:
Collect(colAccount, EditForm1.LastSubmit)
Collect(colAccount, EditForm2.LastSubmit)
OnVisible of screen1, need to clear the collection so the collection will only include new added account names:
Clear(colAccount)
On Screen2 Account DataCardValue, which is a Combo box, set DefaultSelectedItems property as follows:
colAccount
The reason is, Dataverse LookUp column will include all the entries of the main table as selections, to make the two new entries as default values in the Combo box, you can directly use the new submitted records.
Best regards,