there are a number of ways you can do this
1. When you use your combo box have a button to 'add' it, add the bar code to a temporary table, then when you run your query link the temporary table to your table holding the data
2. Use a multi select list box instead of a combo box, then run something similar to suggestion 1 just adding a bunch of bar codes at once instead of 1 at a time by cycling through selected items in a list box. something like:
Code:
with LISTBOXNAME
for i = 0 to .listcount -1 '(use i = 1 if your list box does not have column headers turned on)
if .selected(i) then
'append the value to the temp table
endif
next i
end with