To create a loadable family, you select a family template, and then name and save the family file.
Name the family so it adequately describes the element that it is intended to create. Later, when the family is complete and you load it into a project, the family name displays in the Project Browser and the Type Selector.
You can save families to any local or network location. After you create families, you can use the Copy and Paste commands in Microsoft® Windows Explorer to move the families to different locations.
To create a family with a template
Depending on the current drawing units, the New Family - Select Template File dialog displays the available imperial or metric family templates that are installed in a subfolder of this location:
%ALLUSERSPROFILE%\Autodesk\RVT 2018\Family Templates
The template preview image displays in the upper right corner of the dialog.
The new family opens in the Family Editor. For most families, 2 or more dashed green lines display. These are reference planes, or the working planes that you will use when you create the family geometry.
If you are creating a host-based family, host geometry may also display.
The family views vary depending on the type of family that you create. If necessary, you can create additional views by duplicating and renaming existing views.
Click File tab Save As Family.