Sale and Purchase between two exciasable plants under single company code

Hi Experts,

Please suggest solution with necessary steps for the below requirement,

• > Sale and purchase scenario between two excisable plants under single company code.

• > Suppose say, one excisable plant is in Delhi and another excisable plant is in kolkata.

• > Please Note that Currently we are using STO process, instead we are going for sale and purchase process.

Thanks in advance,

Mahen.