QB Issue Resolution:

Create a dummy bank account called in-trade
create a non inventory item called tradein, and select the dummy bank account on the item screen

on the sale, list what you are selling, last item should be the tradein item, qty =1, and the amount

create a dummy vendor called inhouse
create the new inventory item for the used boat, zero value, zero qty on hand
then buy the used boat item from the inhouse vendor and pay for it from the dummy bank account using the amount of the trade in

sell the used boat item

Resolution for Issue 'How do I show the used boat in so the customer will have a credit towards a new one and then get the used boat into the resold boat as (COGS)?' available: Yes (Solved).
Source: Intuit Community forum.

How do I show the used boat in so the customer will have a credit towards a new one and then get the used boat into the resold boat as (COGS)?: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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