We have a client that is an LLC that received an EIN with an initial partnership tax return due in March 2021. However, he did not have any activity until 2021, and we are now filing his first business tax return. We created a 1065 in ProSeries. Now we have discovered the client did not want a partnership, but an 1120S. Is there anyway to convert his 1065 return to an 1120S return in the 2021 tax program? We are trying to prevent the preparation of the return in the 1120S to save us time. Is this possible?