Deductions & credits

Thank you so much.  This is helpful because I didn't want to report inventory, and so I put "No" in Turbo Tax when asked, but now I have selected "Yes," and put in the "0" and was able to continue on to where I wanted to be.  One more quick question if you don't mind.  I purchased some large showcases and travel cases for the time when I want to sell my jewelry at a festival but haven't done one yet.  Can I write these off as a business expense, and if so, what category are they?  I also bought mannequins and to photograph my jewelry on for listing it on Etsy.  Would these be office expenses?  Thank you in advance.