When linking reactions to the active column calculation, there are four main components to this portion of the window:

1) Linked Load Quantity: Start by specifying how many times the support reaction should occur at each location by updating the "Apply Linked Load ___ times at ea. location" input. This can be useful when a given support reaction occurs multiple times at a single location on the active column (for example, when multiple beams frame into each side of a column).
2) Load Eccentricity: Specify the "X" and "Y" eccentricities to generate moments about the Y-Y and X-X axes, respectively. You can also choose whether the eccentricity is measured from the column centroid or from the column edge, similar to how typical applied loads are handled.
3) Linked Load Location: Define the vertical position of the axial load relative to the bottom of the column. Options include:
Specify: Manually enter an exact location from the bottom of the column.
Top of Column: The load is applied at the top of column. This location will automatically adjust if the column height changes.
4) Add the Linked Load: Once you have defined the settings for the linked load, click the Link Load button.
Once you've click the Link Load button, you will see that the new linked load has been added to the Linked Reactions Table.