You want to enter the 1095-A exactly as it is. You will see "Let us know if these situations apply to you"- select I shared this policy with another who's not on my taxes.
The next page allows you to allocate the amounts. If you shared a Marketplace plan with two or more people who are on separate tax returns, you'll have to find what the SLCSP is for each person's household and add it up. Then, divide your SLCSP by the total SLCSP to get your percentage of premiums and advanced payment of the premium tax credit. The SLCSP percentage is usually left blank.