Determining UCC for vehicle starting on second year of ownership

I'm trying to establish my UCC under these parameters : 

1. Purchased new personal vehicle (A) in 2018.

2. Changed employment and used vehicle A for business use for the first 3 months of that new employment (Sept, Oct, Nov 2019)

3. On December 1, 2019, I leased Vehicle B, and will use the lease payments system instead of the CCA depreciation from then on.

Questions : 

1. How do I establish the initial (Fair Value / UCC) of Vehicle A starting Sept 2019?  I know there's a maximum of $30,000 starting value, and since this is the first year I'm utilizing the CCA, can I still use the max start value? 

Or should I apply the depreciation for 2018, and take the lower amount as a starting point in 2019?

Vehicle A retailed for approximately $60K in 2018.  
Example 1 : $30,000 *.3(for 2018) = $21,000 UCC for 2019 ?

Example 2 : $30,000 UCC for 2019 ?

2. Since I only used Vehicle A for 3 months, do I use the half-year rule ?   or half of the Half-year rule % ?

3. In December, when I leased Vehicle B, I kept Vehicle A as a personal vehicle(Did not sell asset).  How do I enter that in TurboTax ? 

Thank you in advance !

Cheers,