Hello! I am working on a survey with 4 treatment groups. I would like participants to click the link and be randomly assigned to a treatment group (which I have already done). Once they are in the group, I want to randomly select 10 questions (of 30 in a block) for subjects to complete. Note, each group has its own block of 30 questions. Once completing these 10, subjects are asked if they would like to complete 5 more questions.

Here is where I need assistance: If they want to complete more questions, I need to select 5 more (unique) questions from the same block as the original 10 questions. Is there a way to do this without creating 2 blocks? Perhaps I should use Embedded Data?

Thanks in advance!