hi. can u tell me some openings that lead to an isolated queen pawn position? thanks

Queens Gambit Accepted would be the main opening that leads to that sort of position. For example:

I frequently give my opponent one when they play the Guioco Piano.

Panov Attack in the Caro-Kan leads to such a position.

1 e4 c6 2 d4 d5 3 ed ed 4 c4

Panov Attack vs. Caro-Kann, Tarrasch Defence vs. Queen' Gambit, Tarrasch vs. French...various others I can't remember off the top of my head.

The c3 sicilian often leads to an IQP for white.

Exchange French:

Nimzo-Indian. E.g., the Karpov system:

@Nyzik: that isn't a QGA, that's a Meran Semi-Slav.

As noted and in addition to those listed by others above:

French Defense

Sicilian Defense

Tarrasch Defense

Queen's Gambit Declined

Queen's Gambit Accepted

Caro-Kahn

Nimzo-Indian

Alekhine's Defense

Scandinavian Defense

Guioco Piano

Goring Gambit

some lines in the Spanish.

As you can surmise, studying IQP positions can may off handsomely.

An outstanding book for that is Alexander Baburin's "Winning Pawn Structures" which covers not only IQP, but also related families such as pawn couples and hanging pawns in both endgame and middlegame settings.

QGA by transposition.

I don't think it is. In the QGA, Black would have played c7-c5 in one go, so White would have to have lost a tempo somewhere as well. And Black doesn't usually go Nbd7 in the QGA.

What would the QGA move order have been? Just that Black plays ...dxc4 at some point (as he so often does in the Slav and Semi-Slav) doesn't make it a QGA.

If White wants an IQP, he can get one in the Colle-Koltanowski. Palliser discusses this option in his book on that opening.