If you have a bank transaction which relates to invoices or bills that are both within (i.e. in the same entity as that transaction) and without (i.e. in a different group entity), then you can use the following steps to reconcile that transaction in one go using BRAG.
Select the intra-entity invoices
Use the "Find & Match" screen to choose the intra-entity invoices to apply:
In Step 2, choose "New Transaction" > "Spend Money":
This will open a form such as the one below - leave this open
Select the inter-entity invoices
At the top, choose the Mayday tab and select the invoices from other entities in your group:
You can now choose "Continue" in Mayday, and this will add lines to the screen we opened earlier:
Choose "Save Transaction" and then "Reconcile" to complete the process: