There several helpful keyboard combinations in Inventory. These keyboard combinations are typically effecting on moving in list or copying information.
Moves from one text box to another in a row.
Moves from one line to another in the lists.
Activating one line in the list and a second line with shift down, all lines between the selections are also activated.
Press CTRL down it is possible to select any number of rows one by one. Clicking the same line for second time deactivates the line.