I've seen this concatenation (sorry for not knowing the jargon) a lot and the way I've been playing it was like playing four eighth notes but letting go of the first E note ever since it's plucked (as well as playing the other 3 notes, just naturally pluck and let go), which I think is what the half note is used for. What confuses me is that I couldn't find a way in my Guitar Pro 6 to make this notation and instead I put it like this: so I'm not sure if they are really equivalent.
I do not think it's possible to create something like this o gp, although it is not very readable. If you want you can make different tracks on the same instrument with
cmd + n (I think is
ctrl + n on other OS) where
n is a number.
BTW the first image means "play the E and when 2/4 have passed play B, G, B" and the second means "play the E and when 1/8 is passed play B,G,B while the E is sill ringing".
Because of this I'm not so sure of what you want.
Your second example makes sense, and there's no need for the numbers, as the rest in the top voice shows proper timing. I've seen this sort of thing, for guitar specifically, just as four quavers. Usually a player who knows what he's doing will let the 'bass' note ring anyway. It sounds better. Did have a student from another teacher who had taught him to cut off that bass note, so played exactly as 4 quavers, just as written. It sounded awful!