Insert Multiple Rows Using A Stored Procedure

I'm writing a Intranet web application to allow users to add presentation files to a web site for others to download. The presentations are to be grouped by categories, however I want them to be able to create additional categories if needed. I have created two tables.

Table 1 - PresentationCategories
Table 1 Fields - ID, Category

Table 2 - PresentationFiles
Table 2 Fields - ID, Name, Description, Filename, Filesize, CategoryID

On my web page I want to call a stored procedure to insert records into the PresentationFiles table. I have check boxes on the web form for all the possible categories that exist. A user can check each category that this presentation applies too.

In my stored procedure, how do I accomplish inserting a record for each category that is selected on the web form?

I'm guessing that I'll need to pass the categoryID's parameter into the procedure as a delimited string and then process this string for each categoryID and insert records into the PresentationFiles table using a While loop. I'm just not clear on how this is accomplished.

Any advice on how to do it differently or other resources that you can point me to is very much appreciated.