You can update the tool numbers to be sequential within a library by right-clicking the library or tool list and selecting Renumber Tools from the pop-up context menu.
The tools are numbered sequentially beginning with 1 and in the order they are currently being used in the CAM Browser.
You can use the renumbering function if you want to populate the tool magazine with just the tools required for a particular job.
Example part before renumbering
Tool Renumbering dialog box
Example part after renumbering