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Would you like to make families that can change Types based on a parameter? For example, say you have a table family that contains a nested chair family. If the table is larger than, say, 60” diameter, you’d like it to automatically use a different chair. Here’s how you can do this in Revit 2012:
- In the AppMenu, click Open > Family. Navigate to the Furniture folder and open Table-Dining Round w Chairs.rfa.
- In the Insert tab, click Load Family. Navigate to the same folder and load Chair-Task.rfa.
- In the Modify tab, click the Family Types button.
- In the Family Types dialog, click Parameters: Add…
- Create a new Type Parameter named, say, T (for Chair-Task). Set Type of Family as <Family Type…> with category Furniture. OK.
- Repeat steps 3 through 5, but name the parameter B (for Chair-Breuer, the default chair in the Table-Dining Round w Chairs family).
- Select one of the chair groups (it’s a group because it has been arrayed around the table in this family), click Edit Group, then select the chair.
- In the Options Bar, choose <Add Parameter…> from the Label drop-down.
- In the Parameter Properties dialog, name the new parameter L (for Lable). Click OK. In Edit Group, click Finish.
- In the Formula cell for Parameter L, type in “L = “if (Diameter>5’, T, B)”.
- Now, you can try your new formula-driven type by flexing the family: Change the Value of the Diameter parameter (try 4’, then 6’) and see the chairs change when the table gets larger than 60".