Hello - how can we have shipping $ amount on a Item fulfillment hit a GL account, but without showing up a shipping cost to the customer? Would it be something similar to a landed cost on POs/TOs

Use a shipping item that doesn't charge?

i wound’t say shipping item. so for example, freight orders being routed/paid on our side. customer doesn’t pay, but our accounting team wants it to hit a GL team. right now we have a custom field where the cost is populated to track the cost for reporting purposes,

You could do a custom GL plugin.