Is there a way to randomly allocate 1 of 2 embedded data variables, then use the not-selected one

Hi,

I have a subsection of an experiment where there are two conditions that I want the order of randomly presented. Because it is a major variable that affects a lot of later blocks, I'm hoping to be able to randomly set an Embedded Data variable, then later use the other not-selected one.

Is there nice a way of randomly presenting 1 of 2 variables, then using the other non-selected one later?

Jason