auth to new co code

Hi Experts,

We have a scenario. One user have access to one co code(FZ01) for 100 transaction . The user is working with all 100 transaction and Auth. is working correct as planned(create/change /display).

Now the user got additional responsibility and he need to take another co code too(FZ02). But transaction and auth. level  is same as earlier co code(FZ01).

Only change is now its two co code(FZ01 and FZ02)  and  earlier it was one(FZ01). Auth matrix is the same for both co code.

How we can give auth. to this new co code FZ02   .Please suggest the best practice.

regards

manu