Capital gains and losses are entered on Form 1099-B in TaxAct. They automatically flow to Schedule D Capital Gains and Losses and/or Form 8949 Sales and Other Dispositions of Capital Assets.
The 1099-B form you received may or may not report the date acquired or the cost basis. You are responsible for this information, which is needed to complete the proper reporting of the transactions on Schedule D
Entering sale dates for multiple stocks or funds: If you sold stocks, funds, or similar property acquired through several different purchases, report the sale on one form and enter "various" as the date acquired on Schedule D. You must indicate if the sale was a short-term or long-term gain or loss. If the sale included both short-term and long-term gains or losses, enter the sale on two separate Forms 1099-B. (In these instances, you can’t enter "various" as the date sold.)
You can import this information into TaxAct.
See Importing a .CSV File into TaxAct (1099-B) for more information.