Insert X Records In Table Based On Value From Another Table

Newbie question: I have a database where we track dispatched with two tables, one called Slots, the other called Dispatches.
In the slots table there are 2 fields, one called Week (which hold the Monday date for each week in the year), the other called Available (in this field we want to manually enter a number that will tell the system how many dispatches we can do that week). We want to automatically take the number from the Slots.Available and enter X number of blank records in the Dispatch table with the monday date.
How can this be done?
Then we will create a form that can be filled in with the balance of the information.
Thanks