How can i show and save details of two inter-related editable tabs on same page?

I am working on this sales app, where the manager can assign a sales target to an individual salesperson. Now the " Target Amount" can be split into two ways:

1) By adding Items and setting the target value for each.

2) By time i.e. splitting into monthly/quarterly targets.

Now, I have made two separate pages to enter values for both. But Is there any way that I can enter values for both on this same page without jumping to the next page? (Above Page)