How to handle multiple purchase dates (over a year and less than a year) for sale of my LLC partnership interest and its K1 entry?

I purchased membership interest in an LLC at two different times (part over a year and part under a year) and sold them in 2020 however TurboTax desktop is only allowing me to enter a single purchase date so it is categorizing all the gain/loss as long-term instead of some short and some long-term. I have selected "complete" disposition" and "sold partnership interest". There are no "hot assets" to deal with. Is there a way to adjust for this on the actual forms or within the interview?