Started trading as a partnership April 2020. How do I put this year 2020 to 2021 into quick books commercial software for tax return?

Hello Netty-robinson-b, 

Welcome to the Community page, 

So it would be a case of just entering in all your invoices and expenses ect in for that year so that you can then submit the relevant tax returns. If you have the account and used it previously you will need to update the settings, then turn on the vat. you need to make sure that no transactions for the previous years are touched (deleted or amended) then turn on mtd or update the details with us if required then start entering the transactions and then file to hmrc. 

 If new account you only need to add the transactions pertaining to the sates you require to send but just to warn you do not enter in any transactions prior to the date of the first vat return or Quickbooks will report those as exceptions.