Tables > Line Loads prompts you with the following dialog.
It allows you to enter member line loads in a spreadsheet. Each line load includes the member ID, the load coordinate system, direction, start and end magnitudes, and the start and end distances. The load is a force in the local or global X, Y, Z directions. The load distances are the ratio of load start and end locations (measured from the start of the member) to the member length. The member ID must be valid (defined).
An empty row is allowed if all rows below it are empty. Selected rows (whole row must be selected) may be cut by clicking the button “Cut Selected Rows”.