If a line, area, or uniform load affects a length or an area that is difficult to select in the model, select a length or an area close to it. Then define offset distances from the load reference points to set the length or area. You can shorten, lengthen, or divide the loaded length, and enlarge or reduce the loaded area. Offset distances only apply to the outer edges of loads, not the openings in uniform loads.
To define offset distances for a load:
Double-click a load to open its properties dialog box.
On the Distribution tab, enter the distance values in the Distances boxes:
To shorten or divide the length of a line load, enter positive values for a and/or b.
To lengthen a line load, enter negative values for a and/or b.
To enlarge an area load or a uniform load, enter a positive value for a.
To reduce an area load or a uniform load, enter a negative value for a.