It is quite diffucult to understand what exactly you are asking. I guess you already have a material number and you need extend this material number for one more plant?
In this case, indeed, you need to start MM01. I am giving a very simple description.
- Enter your material number
- Choose views you need to extend.
- After that system will ask you to fill out organizational units, insert your plant and press enter.
More information you can find in Google, just type create material master in sap. And you will receive plenty resources. For instance , this one is not bad:
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