there is no way. When you make a macro, it attempts to roll all actions into one single sequence. Hence why you can't have multiple powexecs in the same string. You can't have pets in two actions at once, unfortunately.
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The closest you can get is to make a bind that executes a "Goto" and then loads a new bind file where the same key executes "Attack" instead and loads the original "Goto" bind. That lets you hit a button to send the pets to a spot, then hit the same button again when they arrive to make them attack.
I believe you can do the same thing with macros if you have a power tray you aren't using (which is likely since you get nine).
- Make a macro for Goto that also switches that tray to an unused one
- Set up the second tray exactly like the first one, except that the Goto macro is replaced by an Attack My Target macro that also switches back to the first tray
I don't remember the tray switch commands offhand, but I know Khelds can chain tray swaps with their form shifts in a macro. If it works, you'll be able to click a button to send them to their target and then click the same button to have them attack. You still have to click twice, but at least the whole thing only requires one space in your tray (and an empty tray, but if you're using all nine space isn't an issue 
).
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Mechmeister, level 50 Bots / Traps MM
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Thanks for the help! This saves me hours of monkeying around needlessly with /macros. 
I'm a Necro/Dark MM and I'd like to create a Macro that can send my GKs into melee on a specific target.
I've read the awesome guides by Sandophal, but it looks like most of these are geared towards /binds rather than macros.
I understand that I could have 2 seperate macros (using the /macro command) to do what I want:
/petcom_pow "grave knight" defensive goto
/petcom_pow "grave knight" defensive attack my target
... but was wondering if there is any way to 'chain' these into one /macro.
Thanks for your help!