Hi!
I have a collection MainData3 with 4 fields: CounterParties, Expenses, Sum, Number

And CounterParties its an array:

I create a gallery for MainData3 and a second gallery2 into for ThisItem.CounterParties.
I would like to add and delete into one item some counterParties
And try it, but it just update one Counterparty.
Patch(MainData3;LookUp(MainData3;Expence=ThisItem.Expence);{CounterParties: {Name: ComboBox9.Selected.CounterPartyName}})
How to add new CounterParty to CounterParties Array correctly and how delete separatly from this Array?