Starting business with large inventory - Help with Schedule C Part III

I have been collecting for 30 years and have many boxes of inventory (about $10,000). I am older and decided to start selling my inventory on Ebay and Etsy this past year to supplement my income. Trying to do the Schedule C part 3, but as a new business turbotax doesn’t let you put a starting inventory. So when I put an ending inventory the COG just comes out to 0 when I know my cost of the goods I sold this year was $2,245. How do I account for all my starting inventory?  Called intuit support but they didn’t know. Help