I got a notification that someone used my name :)

"and i need to enter a job/ customer name in order to track all transactions for this specific job.

any advice?"

There is no Job Tracking this payment, because you have not yet bought anything for that job. Throwing money at the supplier is a Prepayment. Also, putting it as AP creates negative AP, or backwards liability. You should check with your own accountant if you are supposed to post it as Vendor Prepayment (your Other Asset) and not backwards Liability (AP).

Right now, this is just a part of Banking and not the actual purchase. Later, when you make the entry for job tracked details, you will want to enter the Gross, then this prepayment will reduce that to Net new money to be paid. Job Track the Gross entries.

If you want to show what you are paying for and job track that, such as, Half of roofing materials and Half of electrical labor, you would make a PO. Swap quantity and Rate, so that Rate is always $1.

Now make a bill from that PO, as Partial Amounts. That's how you Job Track that something for a job, under contract with that supplier, is being partially fulfilled (paid for) and it reveals if they overbill you.