Combine and copy data from two listboxes to a third

Hello,

I am fairly new to VBA development trying to upgrade my employee training database in VBA from a single listbox with single line select/add/edit capability to one that pulls employee data from listbox1, searches training available by job title in listbox2, and combines the data into listbox3 also adding the combined data to an Excel database of completed training. See Pic Below

Ideally, I would like to be able to select multiple people in listbox1 and combine to a single training event in listbox2, and likewise, be able to select multiple training activities in listbox2 that can be combined with a single student in listbox1.

Finally, I need listbox3 to be able to search the completed training records allowing a user to doubleclick the record, edit, and save.

I have created the original tracker database and searchable listbox and the advanced filters to pull data into listboxes 1 & 2, but I am lost on how to select the data in the two listboxes to combine in the third.

Any help is appreciated
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