Using columns in the task and resource outlines
Various columns are available in the task outline and the resource outline; set which columns are visible by choosing View Options from the View menu, or Control-clicking the column headers.
Some of the values in the columns (such as Task Cost) can be edited directly in the outline; others (such as Total Cost) are calculated automatically. Generally, values you can edit in the outline are also editable in the Task Information or Resource Information inspectors.
Use the Arrow keys, or Tab and Shift-Tab (depending the Keyboard Options in OmniPlan's keyboard preferences), to move between cells.
Drag column titles left and right to rearrange the columns.
Each key you set up in the Task and Resource Custom Data inspectors becomes available as a column in the outline.
You can sort the selected items in the outline, or all items (if nothing is selected), by using the Sort commands in the Structure menu.