I want to reduce my CCA claim amounts to zero...but how is that done?? and keep the UCC amount for start of the year??

I have provided a screen shot of the location to change or reduce the CCA claim in Turbo Tax.

where is  the location to change or reduce the CCA claim in Turbo Tax.

In the Capital Cost calculation, either for a Business, Rental Property or Auto Expenses the figure that Turbo Tax displays is the maximum amount. You can simply type over this figure to reduce it to any amount under the maximum including zero. The software will then adjust the UCC for 2018.