From the Assets Menu link – select Link Assets.
Once you have searched and found your identified parent asset, select the image on the left hand side of the grid
This will expand the grid row and present a link icon, select the link icon and a link assets popup window will appear
Search and select (in the tick box) the assets you with to make a child to the parent and select the “Link Selected” button at the bottom left corner.
This will then highlight the asset in the CASM system with a blue row, indicating its a child to a parent asset in the system.