Queries :: Get Value For Field From Another Query

It might be a simple question but I don't know how to solve this:

First: I've created a simple query which gives me the result for a given user input "p".

Code:
SELECT TOP 1 val1
FROM tblPerson
WHERE( (val2)<=[p] )
ORDER BY val2 DESC;

Result looks like:
...|..val1...
...| 12345

Now I've a second query. I would like to get the value for discount from the query above by "putting in p".

Code:
Field.......level......... discount
Table.......adbCases...... qryDiscountGet
Total.......expression.....Group By
Criteria...................[p]=[level]