@NutterButterto give you an example of what we do now is this
1) have a cash account inside of investment umbrella
2) have bonds as ~1/3 of portfolio using a bond ladder
3) bonds generate money that streams to cash account
4) once a month cash account sends money directly to our bank to live off of
5) when bond matures, buy next bond to continue the ladder
This way we never touch the mutual funds in terms of having to sell any shares and just allow the bonds to generate the cash we need to live off of. This allows our balance to remain intact with out having to shift money often.
This is all done in a non retirement account because of our age but the same general format is used frequently for people in retirement who need a monthly stipend from their investments to live off of.