You can search for multiple values with a search syntax like this:
=match(field,value1,value2,value3)
I'm not sure how you get the data from the users, but let's say you get it as a list of values like this:
value1
value2
value3
You could probably have them paste this list into a variable, use text manipulation commands to turn it into the match() syntax for a search, and then trigger an action to select based on that search. I thought I posted an example of this somewhere, but I'm not seeing it on my machine.
Edit: Yeah, I couldn't find the example, so here's a new one. Only problem is that if you paste the list directly into the variable, it converts the line feeds to spaces. To prevent that, you have to click on the '...' to pull up a bigger enterable area that allows line feeds. You'd use a similar approach with a comma separated list.
In case it's hard to track down how its doing what its doing, in the document properties, under triggers, there's an action OnInput of the variable List. The search string does the text manipulation and looks like this:
='=match(Field,' & chr(39) & replace(List,'
',chr(39)&','&chr(39)) & chr(39)&')'
Edit: I assume the account numbers don't have spaces in them. That would let you fix the cut and paste problem by replacing both spaces and line feeds with chr(39)&','&chr(39). And actually, with numbers, I doubt you even need the quotes. So you might end up with something like this:
='=match(Field,' & replace(replace(List,' ',','),'
',',')&')'
