Can I adjust or add feedrate changes to an existing toolpath?
The ability to adjust your feedrates along your toolpath is included in GibbsCAM version 6.0 and later. To use this functionality right-click on the operation and select Utility Markers. U markers will appear at every position where a feedrate change is occurring. To add changes drag the U from the Utility Marker dialog and place it on the red toolpath lines.
You can also use the 'Change Feeds and Speeds' plug-in found under Plug-Ins-->HSM to apply changes to the feeds and speeds of an operation