Planning Work missions is one of the setup missions required for The Podium Robbery in GTA Online's The Chop Shop DLC. The missions involve acquiring LSDS Disguises and a Storage Key Card, as well as an optional mission to disrupt casino personnel.

You can start all your planning work missions from the planning screen by accessing the computer from your Salvage Yard.

Planning Work missions are mandatory missions you must complete to do the robbery. They are the primary setup missions. There is always one optional disruption mission that helps make your final robbery mission relatively easier.

Planning Work 1: LSDS Disguises

In this mission, you must steal an LSDS van and bring it to the Salvage Yard. However, before you can get your hands on the van, you must cause some mayhem at a sewage treatment plant.

When you arrive at the treatment works, find a good vantage point and use an RPG to destroy the three parked sewage tankers.

Good vantage point.
Destroying the sewage tankers.

Next, you need to unscrew the release valves to further contaminate the area. Once you've destroyed the sewage tankers, eliminate as many enemies as possible before you go for the valves.

It will make your life easier.

You don't have to worry about the rest of the enemies. They take some time before coming. But still, it is best to try to be quick because more enemies will eventually catch up.