You don't need to enter any of the information from the partnership percentages. For the sale of your interest in the partnership, you'll use the basis information in the bottom left section of your Schedule K-1 (and it may be helpful if you have last years K-1 and any other records handy).
Resources for understanding basis calculation and partnership interest sales:
I believe you're asking for general information about partnership interest, but if this isn't the case please elaborate on your question and let me know more details.