Say you are building a computer (asset) that has a case, motherboard, power supply, cpu, heatsink, memory, os, etc (products) you could then click on an asset and show everything inside it.
Or, you are repairing a computer (asset) and replace the HD with an SSD. Or add memory. Or swap a power supply. All products.
You can see that on the invoice if you bill it. Otherwise you would have to go through each of the tickets associated with the asset to see what you might have installed in it.