I claim rental property current expenses. But is there a field where I can also enter CAPITAL expenses? I don't want CCA. But should I not be tracking / entering this?

CCA is capital cost allowance and it's where you would enter and keep track of your capital expenses. If you don't want to take CCA, then you would have to keep track of your capital expenses on your own, and then add them to the value of your property when you sell it.