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 objects you want to remove.

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

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.

   Tekla Structures highlights the other parts that belong to the same cast unit. 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

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