BPC Time Dimension - 13 periods NOT Calendar

My client reports 13 periods in a year (4 weekly).

Quarter two contains 4 periods (periods 4, 5, 6, 7).

I was reading a post about how to set this up properly using the UserTimeId property. They had a situation where they needed to put their 13th period in Qtr 4, and they discussed using this property, but the answer didn't go into exactly what settings to put in the UserTimeid property.

Could someone explain how to set this up in BPC so that it calculates properly - my system is a YearToDate system (not periodic),

regards

scott Farrington