Saving Combo box values in Db during the Edit Screen - PowerApps

[Rajapriya]

There is a Add screen which i added 3 items  (Apple, mango , orange) from combo box items and saved in DB. Each items saved as 3 rows,. Similarly I got the 3 items in edit screen example (Apple, mango , orange) , Now i am adding Grapes in combo box.

1. In submit button in edit screen ill patch only the grapes Since other 3 items already there in DB table. Now 

ForAll( cmbImpactedDoc.SelectedItems,
If( IsEmpty( Filter( <table > , column in ThisRecord.FruitId && ScreenEditId= ScreenId) ),
Patch(

This is now working when using IN and getting delegation error. how to solve that?

2. If suppose iam deleting a orange from combobox (Apple,Mango, Grapes) , Then how to proceed here?

Thanks