Hi @Stephanie073 ,
Unfortunately, Shopify “Reserve Items” does not actually reduce the inventory count.
To workaround this, I have recently added a feature to Draft Order Helper app (https://apps.shopify.com/draft-helper ) that allows you to deduct inventories for products used in a draft order in one click :
After installing the app, you can go to your draft order, select “More actions” > “Adjust inventory” , then deduct the inventories of the products used in the draft order, this will make the inventory number go down, and trigger the Trunk inventory sync to make the linked products inventory to go down as well.
The app has a free plan (5 free inventories deduction) which you can give it a try, https://apps.shopify.com/draft-helper, hope this can help you!
Regards,
Axel Kee