How to sell specific "OLD NISA" year on Rakuten

[MyTime]

Yes that is correct and yes you can do that.

Many thanks for the confirmation!

[MyTime]

Better to specify the number of units (口), rather than the monetary amount. Then you'll definitely clear out 2020's allowance,

Thanks for the reply.
After thinking about it a little more, that's exactly what I did. After selecting the funds that I wanted to sell, I was given the option of entering either monetary amount that I wanted to sell, or the number of units that I wanted to sell.