Using Extruded Aluminum to telescope.

[LGuY]

Hi, My team and I are interested in knowing how one would use extruded aluminum, since it is slotted, as a rail system for telescoping part of am arm. We purchased a kit that comes with 80' of the 3/4" material along with a bunch of small pieces used to connect them all but no manual whatsoever. The aluminum is from Item. Does Item make any piece that can freely slide along the slots in the aluminum for which a team can motorize and power? I tried searching myself but I turned up only more confusion, any help would be appreciated. Thank you!