I have adjustments from a closed period that has the wrong unit cost. An adjustment was made to offset it go the GL is OK. But my inventory valuation is way off. How can I revalue the inventory without it affecting the GL?

I don’t think this is possible. By nature inventory is part of your financials so revaluing it or changing the financial impact will always affect the GL. In the past I’ve used the Adjust Inventory Worksheet to change the Inventory value. I would recommend posting the change on the first day of the oldest Open accounting period you can. I would post it to the same account as the original incorrect adjustment.

You can't.... You're impacting your inventory assets so the GL will be impacted.