The Reference Line tool (Create tab Datum panel Reference Line) creates a line similar to a reference plane, but that has logical start and end points. The Reference Plane tool (Create tab Datum panel Reference Plane) creates a reference plane, which is an infinite plane that serves as a guide for drawing lines and geometry. Note: The Opening tool is also available in the project environment. For example, if you select Coarse, the symbolic lines are visible when you load the family into a project and place it in a view at the Coarse detail level. In this dialog, you can also control the visibility of lines based on the detail level of the view. In the Family element visibility settings dialog, select Show only if instance is cut. Select the symbolic line, and click Modify | Lines tab Visibility panel Visibility Settings. 
You can control symbolic line visibility on cut instances. Symbolic lines are visible parallel to the view in which you draw them. Symbolic lines are not part of the actual geometry of the family. For example, you might use symbolic lines in an elevation view to represent a door swing, or to represent the flow direction for a pipe fitting.
The Symbolic Line tool (Annotate tab Detail panel Symbolic Line) lets you draw lines that are meant for symbolic purposes only. You can control their visibility in plan and elevation views by selecting the lines and clicking Modify | Lines tab Visibility panel Visibility Settings. Model lines are always visible in 3D views. For example, you could draw door panels and hardware or duct as 2D rather than use solid extrusions. The Model Line tool (Create tab Model panel Model Line) lets you draw two-dimensional geometry for when you do not need to show solid geometry. This is important if you wish to create different sizes of the family. The Dimension tools (Annotate tab Dimension panel) add permanent dimensions to the family, in addition to ones that Revit automatically creates as you draw the geometry. 
You can create new family types or new instance and type parameters.
The Family Types tool (Create tab Properties panel Family Types) opens the Family Types dialog.
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