Multiple Qty for each RSmembership items

I had members who like to sign up for X no of qty.

Is there anyway to add the x no of qty and the duration as pple would like to sign up x no of weeks.

Eg. One of my subscription works in weeks.

So members would like to sign up for WK05 of 2013 to WK 10 of 2013 and would like to select the date range so that the system would trigger the no of weeks rang.

So it would be mean the potential members want to sign up for 5 week of members?