How to bring information from multiple columns into one column?

I’ve had to split a table containing working groups (A, B, C, D), trails (X, Y, Z), trail-secteurs (P, Q, R, S, T), trail-sections (green, blue, red) and ToDos into multiple separate columns because I want to minimise the selecting options. Not all working groups are working on the same trails and obviously every trail has different trail-secteurs and trail-sections.

Example: In working groups I select group B, which opens the trails with only the available options for group B. I select trail X and the names of the different sections of trail X appear. If I select trail secteur Q , I choose the trail section blue out of the three options. After selecting the section the ToDos appear of which I can select multiple.

I’ve had to separate everything in separate columns for that. Now I’d like to export it so that I do have only one column for working groups, trails, trail-secteur, trail-section and ToDos.

How can I do that? To only visually combine them I could use virtual columns. Though I’d like to export them as csv.

You can use a normal (not virtual) column to do this.

but then I have to create another column in the spreadsheet, haven’t I? Can I define in a “behaviour” that I only want this column (the combined) without having all the others which are the base for the combined column?

Yes, you’d need another column in the spreadsheet.

The base columns have to exist in some spreadsheet somewhere to accept user input.