When performing calculations in SimaPro desktop, it is possible to show the input amounts for lower tiers in the units they were built in addition to percentages via Network view. This way, minor contributors will also become visible along with processes with main impact due to the pre-defined cut-off value. Several steps that need to be taken are:
Select an item in Tree
Click Details button next to the Cut-Off field
Go to Process Contribution (make sure the indicator is set to amount)
Right-click to select Copy
The window will be updated when you click different items in Tree