Four sizes, three colours, and a different stock for each. That is where the youth camp spreadsheet gives up.
Knowing twenty t-shirts are left is useless if all twenty are XL. What you need is how many navy mediums remain — and that is twelve times more counting.
A church does not ship, and that is fine: people are coming on Sunday anyway. What remains is knowing who paid for what.
Someone buying their own church's t-shirt should recognise their church, not discover a platform they have never heard of.
A short list beats a broad promise. Here are both, without rounding.
Create an account, add the t-shirt with its sizes, and let the orders arrive while you prepare the rest.