Return multiple matching lines using VLOOKUP?

I've looked at a number of solutions here for this seemingly common request, but can't manage to succesfully adapt any to work on my spreadsheet. I'm trying to create my own (basic!) invoicing worksheet, attached.

I'm using drop down lists and vlookups to pull together most of the invoice worksheet itself, but need to extract multiple data from a "jobs" sheet where the inv number matches that selected from the drop down list.

I understand a count is a half-way house, so have added that.

All help much appreciated!

This is my first post on this forum, so please let me know if I'm not following protocol!

In A17 enter this formula:

=IF(ROWS($A$1:$A1)>$B$26,"",INDEX(jobs!D:D,MATCH(ROWS($A$1:$A1),jobs!$I:$I)))

and copy down and across the table.