Unless you sold a block of stock this year, you may combine stock purchases in whatever format you need, as long as you can track the basis for those purchases. Pass-through items (Schedule K-1) are generally allocated pro-rata to all shares, regardless of their different bases.
However, each sale must be allocated to the basis for that particular block of stock. If you sell a block of stock, you would need to file at least two Forms 7203 - one for the sale and one for the remaining shares.
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