How to randomise order of survey items in Qualtrics where some items have to appear together? I have a quick question regarding survey construction that I'm hoping to get some clarification on.

Here's my current survey set-up:


Question 1
Question 1a (i.e., a question that relates to information provided in Q1)
Question 2
Question 2a
Question 3
Question 3a


...and so on and so forth.

Here's what I'm looking to do: I'd like to present these questions in a random order, however, Question X and Question Xa have to stay together. Is there a way to "glue" related questions together, and randomize presentation of those "glued" pairs within the Qualtrics platform?
There is probably a better way of doing this, but you could probably do this using the block feature in Qualtrics. For example, I often do this when I have several multi-item scales. Each scale is a block. You might randomise item order within a block, but you can also randomise the order of blocks.

So you could group questions (e.g., 1 and 1a) into their own block and then randomise blocks.

See here for info: https://www.qualtrics.com/support/survey-platform/survey-module/survey-flow/standard-elements/randomizer/