Storing A Parameter?

Hello,
I am designing a query as i have been advised in the following Quote:
Doc ManNow, you write a couple of queries. As a parameter to the queries, choose a date that will be your archiving cutoff or split point. Usually the last day of some month or quarter. Doesn't matter as long as you are consistent about it. The technical cutoff will be, in effect, 23:59:59 of the chosen date. The first record to be KEPT will be 00:00:00 of the next day in sequence.

Query #1 - Compute stock on hand as of your cutoff date. Create a single stock-on-hand transaction with the cutoff date. Put it in a temporary table until you need it. This will be a two-layer query. I.e. a query of a query.

Query #1A - a summation query grouped by item number for all transactions earlier than the archiving date so you can get the "inventory of X at archiving date"

Query #1B - an append query that draws from the summation query and feeds it to the temp table. The stock-on-hand record will have the archiving date

.
I am able to get "inventory of X at archiving date" and append the results to a temporary table but I can't see how to append the "archiving Date" data itself to the same table as the "Archiving date" is entered via parameter prompt? Any ideas?