parenting

I'm working on a trade map and I have my health and ammo pickups set as children of a func_physbox so they can rotate. The only issue is that this breaks their auto-materialize functionality, or at least it seems that way. When I pick them up, the never respawn. Is there a way I can fix this...

for the past hour or 2 i am trying to make a cart for a halloween map i am working on which i want to test first all the logic i want to import to the map afterwards and stuff. i have a coffin and 3 pumkings i want to add to the cart. without those 4 props the cart moves no problem there , but...

If player will jump on top of the func_tracktrain, or func_movelinear, they will continue moving, but player will not move with them, and after few jumps he will fall of. And if engineer will build building on them, building will stand still, but train will continue moving. How to make player...