Step 1: From the Dashboard, select "Products."
Step 2: Click on "Units" to initiate the unit addition process.
Step 3: Add the name of the unit, short form of the unit, allow decimals, and click "Save" for the base unit.
Step 4: Similarly, create units for parent and child, click "Add as multiple of other unit," enter a quantity of 1 unit, and select the base unit.
Step 5: For the parent unit, add products by selecting the sub-unit, choosing the business location, entering the price, and clicking "Save."
Step 6: For the child unit, add products by selecting the parent product, choosing the child sub-unit, selecting the business location, entering the price, and clicking "Save."
Step 7: Now you can view the products in the combined products section.