Edit: Thanks to a few helpful posters, I found out that I can't cleanly do what I want to do, but there are methods involving hotbar switching.
Please check out this thread, and encourage SE to change it.
I play on the PC with an xbox controller and I want to consolidate some macros. I can't actually get a simple test of eaction to work (I am on arcanist while testing this, so it's not an issue of not having the JA)
/eaction 6 "Bio" doesn't put Bio anywhere on my bars. I do have my 1-0 and c1-c0 bars shown just for out of the way buffs I don't mind clicking. 6 is an empty slot.
Any advice is appreciated, and any advice for how to work with the crossbar slot names, if they're special, would be great.