Basel III Tier 1 and Tier 2 Capital

On Tier 1 and Tier 2 capital, would these be equity and liability accounts for a bank?

For example, Tier 2 capital (sub instruments with original maturity >5 years) would be sub debt issued by the bank, and therefore is a liability on the bank’s balance sheet and a source of cash; it would not be sub debt assets that were purchased by the bank.

My intuition is that you can’t use assets to fund RWA - it would have to be from the other side of the balance sheet. Am I thinking about this correctly?

The sub debt accounts for The capital (secondary capital of the bank regarding Basel III) is not related to RWA, RWA are assets funded by deposits, sub debt, equity, etc. That have different credit risk, and that’s why the weight