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"Once we are ready to invoice the job how do I transfer t...

"Once we are ready to invoice the job how do I transfer the retainer deposit money from the sales receipt to the invoice?"

The same Prepayment item you put on that initial Sales Receipt, you will now put on a Credit Memo for the date of the invoice or later (not earlier than the invoice date).

Apply this credit memo to that invoice.

This assumes you don't have Trust Accounting requirements.