We’re hoping to design a survey in which we assign participants to 10 random conditions out of 45. I know we can assign random numbers to participants, but we would need to ensure that they aren’t assigned the random number on any of the successive assignments.
It sounds like you need respondents to go through different versions of your survey? The only way I could think to do this is have a percent branch for different branches of the survey. Here’s a little more info on percent branching.
If that’s not what you mean, could you maybe explain a little more? Cheers!