MOVE_SECTOR

Usage:
MOVE_SECTOR <sector tag> <height change> <surface>

Description:
Use this to move the floor or ceiling of a sector (or multiple sectors, if they share the same tag).

Details:
<sector tag> is the sector tag in your map editor.

<height change> is how far the sector is to move. Use a positive number to raise, and a negative number to lower.

<surface> specifies whether you want to move the floor or the ceiling. Possible values are:

You can use MOVE_SECTOR multiple times, for example to raise or lower the floor and ceiling of a sector at the same time.

Combine a small <height change> with TAGGED_REPEATABLE for a gradual movement (like a door or platform), instead of an instant movement to the specified height.

Example:
This script will slowly raise the starting area on DOOM2's MAP08 (Tricks and Traps). 

START_MAP map08
  RADIUS_TRIGGER 0 0 -1
    TAGGED_REPEATABLE 64 1T
    MOVE_SECTOR 8 1 floor
  END_RADIUS_TRIGGER
END_MAP