Pricing procdure

Dear Gurus,

I have a requirement as in pricing procedure changes.

we have ABC Pricing proce. assigned to one sales area with DuPP and CuPP, but one special month (Eg: Oct) it has to pick new pricing procedure Eg: ZXYZ automatic. again the month of Nov the old pricing proced ABC can take automatically.

Is there any standard process? are need any routine?. how to approach this requirement?