Node Local Axis
Declare a local coordinate system for selected nodes to enter boundary conditions or produce output for reactions.
From the Main Menu select Model > Boundaries > Node's local Axis.
Select Geometry > Boundaries > Node Local Axis in the Menu tab of the Tree Menu.
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to the right of 
Options
3 points: Specify 3 nodal coordinates to define the node's local coordinate system
P0: Coordinates of the origin of the node's local coordinate system
P1: Coordinates of an arbitrary node on the node's local x-axis
P2: Coordinates of a node moved from P1, parallel to the node's local y-axis
Vector: Specify 2 vectors to define the node's local coordinate system
V1: x-direction vector starting from the origin of the node's local coordinate system
V2: Vector starting from the origin of the node's local coordinate system to the point P2 of the 3 points method above
Note
The following are the application functions for Node Local Axis:
"Supports"
"Surface Spring Supports" (in case of Convert to Point Spring)
"Specified Displacements of Supports"
"Reaction Forces/Moments" of "Reactions"
"Reactions" of "Influence Lines"
"Reactions" of "Influence Surfaces"