You have sliced your cable tray, but it no longer shows up in the BOM.
CADWorx® does not process modified user shapes or lengths for generic attached items.
- Insert the tray
- Remove all CWXdata
- Explode tray TWICE
- Slice object to desired length
- Generic Attach data back to the solid
For the slicing video choose the Trim Tray in 2020R2