Unfortunately, there isn’t a way of holding funds on a suppliers account from a negative invoice. You could either have to credit individual invoices, or you could create a holding account.
There’s more information on a holding account in this topic:
What you would do in this instance is enter multiple “bank” lines to correspond with the credit note you have been issued, and tag those against the relevant invoices:
And then to each relevant invoice:
You could then either tag a lump payment as funds on the suppliers account, or hold it there in the holding account and pay another invoice from that account
Where there’s a case of an invoice with multiple nominal codes, you would need to raise a credit note for that invoice.
Hope that helps (and makes sense!)