Where do I itemize NON "incidential" personal business expenses?

Hello! I'm wondering where to record big-ticket home office expenses – things like a desk I bought at Ikea, for instance, or a desktop computer. I see a category for office expenses (software, decorations), and a category for supplies (incidental items like pens and ink cartridges), but nothing for larger, more expensive, semi-permanent equipment like computers or furniture. Thank you!