To add Product in all the Branches, follow the below mentioned steps.
Step 1: Go to side bar menu, select Products & Services.
Step 2: Check right hand side you will see +New Item option. Tap on that?
Step 3: Add product Name & Details
Step 4: Click to Add Item Option on the top right hand side.
Step 5: Select option in the small box to add your product in all the Branches.
Step 6: Then click on Save button.