Cycle Counting

Hi experts!!

I'm implementing the Cycle Counting functionality in SAP R3 4.6c IM and I have the following doubt. I need to set the following:

- Times per year I want to count the materials

- The system must automatically select the materials to be counted

- It is possible to count a small portion automatically and randomly selected every weekend? i.e. 5 materials per weekend. I can't find this in OMCO.

Thanks in advance!!!

Regards, Ignacio.