I have a 2020 A Spec AWD that came without a spare. I plan to add one. How do you remove the cargo compartment that is under the cargo deck to make room for the tire?

 

I just added to spare to my 23 A Spec. Acura sells a kit that includes everything except the tire. P/N: 06421-TJB-A00 (19”), P/N: 06421-TJB-A50 (20”)
I went to Discount tire for a new tire. its a new car so I wanted a new tire. You might be able to find one on Craigslist cheap. The kit is an easy install. Google the part number to find instructions.