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The rental portion should be sold in the rental asset section. This will allocate the appropriate action on the depreciation portion.

Then the remainder of the rental house should be entered in the investment sale section.

Here is a sample of the proration of the sales price, although it's discussing rental you can add the inherited portion of the house to find the figures for both.

The selling price should be prorated for each asset then entered for each asset when you indicate they were sold or disposed of. You will not lose the remaining depreciation because you will use the remaining basis against the selling price to determine gain or loss. 

To figure out the selling price for each asset:

1. Take the current basis of each asset against the total combined basis of all of your assets to figure out the sales price for each one; OR 
2. Determine a fair market value for each asset against the total value of all assets to figure out the sale price for each one. 

Use the original cost of each asset listed on depreciation (all belongs to house B now) add those together then divide each one by the combined total to find the percentage of the cost for each asset.  Use that percentage times the sales price and sales expenses to find the selling price/sales expenses for each asset.

Example:  Original Cost (of each asset on your depreciation schedule)

$10,000 Land                = 13.33% 

$50,000 House              = 66.67%

$15,000 Improvements  = 20%

$75,000 Total                 = 100%

Multiply each percentage times the sales price/sales expenses to arrive at each individual sales price/sales expense.

The sale of inherited property can be entered using the following instructions.  

1. Open or continue your return (you can choose the Search box and type 'sale of second home' then use the Jump to link to enter your inherited sale) or follow the menu.
2. Under Wages & Income scroll to Stocks, Cryptocurrency, Mutual Funds, Bonds, Other (1099-B)
3. Answer Yes on the Did you sell any stocks, mutual funds, bonds, or other investments in 2021? screen
   • If you land on the Your investment sales summary screen, select Add More Sales
4. On the OK, let's start with one investment type screen, select Other, then Continue
5. On the Tell us more about this sale screen, enter the name of the person or institution that brokered the sale
6. On the next screen, select  Other (choose this also for inherited homes) then select I inherited it under How did you receive this investment?