I need a solution/work around Data Mesh not pulling in Columns with Column formulas

Here is my scenario:

I have my source sheet that collects data from a form. The form is set up dynamically to allow the user to select different options from a multi-select drop down list based on which team they would like to work with.

This creates multiple columns, so to aggregate all of the options selected in to (1) cell I added a helper column in the source sheet that uses a join formula that I set as a column formula.

I want to pull the data from specific columns as well as the aggregated column into the target sheet, however I keep getting an error.

The only solution I can think of is creating a workflow to a helper sheet and using that as the source data for the data mesh since the helper sheet would not carry the formulas.

Is that the appropriate way to manage this?

Answers