Hi, I sell jewelry online and I'm new to business and accounting. So please use simple words as I'm still learning the terms. 

My main product is earrings. To sell the earrings, depending upon each order, I'd need one or more earring cards, cardboard boxes, stickers etc.

At first, my plan was to write these under expenses but I can't track inventory and accounting. I need to be able track it but not show in the invoice as I'm not charging  the customer for these items. I'd need to track also bcz I don't want to treat it just an an expense but more like an asset. Please help me with this.