The main part in a concrete cast unit is the one with the largest volume of concrete. You can change the main part in a cast unit.

1. If needed, check what is currently the main part of the cast unit.

   Use the Inquire tool to check which objects belong to a particular cast unit.

2. Ensure that the Select objects in assemblies selection switch is active.
3. Select the new main part.
4. Right-click and select Set as new main part of assembly.

1. On the Concrete tab, click Cast unit > Remove from cast unit.
2. Select the object you want to remove from the cast unit.

   You need to restart the command to remove another object.

Use the Inquire tool to check which objects belong to a particular cast unit or assembly.

1. On the ribbon, click the down arrow next to , and then select Assembly objects.
2. Select a part that belongs to a cast unit or an assembly.

   Tekla Structures highlights the other parts that belong to the same cast unit or assembly. The following colors are used:

   Object type	Highlight color
   Concrete - main part	magenta
   Concrete - secondary part	cyan
   Reinforcement	blue
   Steel part - main part	orange
   Steel part - secondary part	yellow

You can ungroup the objects belonging to a cast unit.

1. On the Concrete tab, click Cast unit > Explode.
2. Select an object in the cast unit you want to explode.