Edward, if you are serious about keeping an inventory, I have found QuickBooks for business the best and easiest way to do so.
I used it for over 20 years in my husbands business. When he retired, I use it to keep track of my business items. You give each item a name or number, enter it into a category, give them a price, and check that you want to keep track of your inventory. It will do that automatically, both with sales items, equipment, supplies and any other thing you can think of. The beginning entry is the most tedious, but once done,it is a cinch. You can check QuickBooks out on YouTube to see if you want to try it. The program can be costly.
Now that I am retired, I keep it super simple. I take a photo of each style (or item), put it in a catalog style listing with a number and just keep track of "on hand" and "sold" items. Of course it does show the price too if there is one. 80% my items now are not sold, but donated to my local Toys for Tots Foundation. I only keep track of what I cut for friends or family so I do not duplicate a gift.