Many to Many or Many to 1?

I need help deciding whether my rule should be Many‑to‑Many or Many‑to‑1.

Scenario:

GL Side

ID field = TCH
Date = same day
There are multiple GL transactions for that ID/date, and together they total 300,000.

Bank Side

CH field can be NO, OS, or NS
Bank Date can be within 7 days after the GL date
There are Bank transactions for the CH field and different bank dates, and together they total 300,000.

Rule Setup So Far

I applied filters on both GL and Bank sides.
I grouped the GL conditions by ID field + Date.

The match conditions include:

Amount = exact match