so I get that you leave a board under each tier.. I understand about the dowel rods..

my question is.. when the top layer is lifted off, cut, eaten.. whatever.. does the buttercream come off with the board when you remove it to get to the second tier?

and thank you in advance

It might. Really, not important. If you're using a crusting bc, then wait for it to crust well before stacking and you'll be fine. If you use a non crusting bc, then put a round of parchment, or I use sugar crystals under the plate area.

Covering the cakeboard both sides with wax paper is a good idea too
Edna

I've heard of people putting shredded coconut underneath the cake boards to avoid the icing coming off, but I've never tried it and I don't really think it matters. If you buttercream is crusted enough you shouldn't have a problem.

I've seen people say they put a little cornstartch or powdered sugar. I don't use anything. Sometimes a very little bit pulls off. I just scrape it off the board and put it back on. Once the cutting begins nobody will even notice.

I suppose you could always use the waxed boards, and use the white wax side down.