Trim / Extend of Structural Member in Assembly

Is there a way to trim / extend structural member in assembly? (example: corner trim of two equal angle)

I tried weldment feature but the weldment structural member selection in the drop down list has only two choices (ansi inch and iso).

The type and sizes are also incomplete. Any help?

Message was edited by: Noriel Eje

SolidworksWeldments