...
Each Family Type and some Categories have their own Element Orientation properties. The Family Map Wizard will set default values that can be changed. For a wall there are two Orientation values that are needed: Family Length Axis and Family Width Axis, which have the default values of Bottom-Top and Left-Right respectively. Those default values work for the selected family so clicking Next will proceed to the final page in the wizard: Family Properties.
...
The Family Properties tab is used to map Sync Design Properties to Family Properties and set the Property Type. For example, for solid panel families the value of the thickness of the panel needs to be mapped to a property of the family. Clicking the drop-down box next to Thickness in the Family Property column will bring up a list of all property parameters, both instance and type.
The list of property parameters is scrollable to find the property to map to the Sync Design Property. Text can also be typed into the Family Property drop down box to search for a property in the list or to enter a constant value. If a constant value is to be entered then the Property Type must be changed from Parameter to Constant.
...
For this example, the Design Property of Thickness is mapped to the Family Property of DIM_THICKNESS.
The Property Type must then be selected. There are two choices for Property Type: Parameter or Constant. A Parameter is a property parameter of the family in Revit. A Constant is a value that is typed into the Family Property box. Here since the property parameter DIM_THICKNESS of the family is mapped to Thickness then the Property Type is set to Parameter.
...
All family map entries are created in the same manner. If the property is mapped to a parameter in the family then set the Property Type to Parameter and select the property in the drop down box under Family Property. If the property is a constant value then select Constant in the Property Type drop down and enter the value in the Family Property box.
...
A family property can be left blank but then Sync just won’t use that value when mapping properties for that family.
Once all properties are mapped, clicking the Finish button will create the family map entry and update the family map. The initial operation that caused the Family Map Wizard to appear will then continue with the newly created family map entry.