after you deposit the first 800k (coming from outside Thailand), same procedure. You start after 90 day the 2nd year for Non O-A (800k 2 months before and 3 months after extension and then not under 400k). I have a second deposit account with 800k and dont touch it. I use my saving accounts for virements and transfer of THB from my home country.
you need only show the requirement of 800k 2 months before first extension for 1 year. For the second year, you need to show not less than 800k during 3 months after 1 year extension, not under 400k after and 800k 2 months before 2nd extension. (This is for a visa non O-A outside Thailand).
The money you use to live, you could transfer at your wish.