An RPC family is a Revit entourage family created using the RPC Family.rft or Metric RPC Family.rft template files. For these entourage objects, you can specify RPC files to use for their render appearances. 
- Open the Revit RPC family in the Family Editor. 
 
- Click Create tab
Properties panel
 (Family Types).  
- For Name, select the family type to modify. 
 
- Click the Identity Data header to display its parameters. 
 
- For Render Appearance, click the button in the Value column. 
The Render Appearance Library displays. 
  
- Locate the desired render appearance, select it, and click OK. 
 
- In the Family Types dialog, for Render Appearance Properties, click Edit. 
 
- Specify parameters for the render appearance, and click OK. 
 
- In the Family Types dialog, click Apply. 
 
- (Optional) Repeat this process for other family types defined for the RPC family. 
 
- Click OK. 
 
- Save changes to the RPC family.