Setting Append and OPP period to utilize tapes in partition

Dear All,

In my autoloader library I have defined a partition for weekly full backup and there are two slots in it. I am looking suitable way to define append and OPP period in order to use two tapes effectively, like Tape1 in first week end, Tape2 in second week

Third week I have another set of two tapes, and want to use them also like third week end write on Tape3 and Tape 4 in 4th week, then next month again insert the first set i.e. Tape1 and Tape2

Please help on this for suitable OPP and append period settings