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Yes you can I remove these individual 8949 transactions from TT and put a single summary transaction. 

If you choose the option to enter a summary instead of entering each sale, then you have to mail a copy of the brokerage statement listing the individual sales. You have to send a statement.

If you e-file, TurboTax will produce a Form 8453. You print the Form 8453 and attach the brokerage statement(s) to it. If you file by mail, attach the statement(s) at the back of your tax return, after all the forms and schedules. In either case, click the "mailing instructions" link in the message at the bottom of the TurboTax page and follow the instructions that it displays.

No you should not change the individual 3/20 sale transaction basis in Box 1e and delete the disallowed wash sale amount from box 1g?

Here is how to post it.

Income & Expenses

1. Scroll to Stocks, Mutual Funds, Bonds, Other
2. Answer Yes to Did you sell stocks, mutual funds, bonds, or other investments in 2020?
3. On the OK, what type of investments did you sell? screen, select Stock, Bonds, Mutual Funds. Then select Continue.
4. From here, you can import or manually enter your 1099-B.
5. Answer the questions about your sales. Choose to Enter sales one by one when asked.
6. On the Now, we'll enter one sale on your 1099-B screen, enter your info.
7. Check I have other boxes on my 1099-B to enter and enter the disallowed wash sale loss in box 1g.
8. Select Continue and answer any follow-up questions.

Note: You'll need TurboTax Premier, TurboTax Live Premier, or TurboTax Self-Employed, TurboTax Live Self-Employed, to add any 1099-B forms.