How do I expense out my credit card purchases

I'm not sure how to do this. I have been entering in my credit card payments in the "payment in transit" category, but not sure about what to do with the purchases I made on the statement. For example, I bought  supplies, materials and paid my sales tax to state comptroller, since these are purchases that I have not paid for completely, would I still put each one in its separate category or would it be in liabilities?

Thanks in advance,

Richard