Locate the asset using the asset details editor
Search >search for assets > enter the unique asset details and click apply filter
choose the asset > click Edit this item
Find the links tab on the asset details editor screen
click the link asset button
a new menu will pop up where the search details of the child asset may be entered
enter the proper search criteria and click search
click the edit box then entered the quantity to link
click the orange update box
Click the checkbox to the left of the asset(s) to be linked and when finished click the link asset button at the bottom of the screen
A new entry will show in the linked assets tab