By default, the bottom is not finished. The roughing tool removes all of the material in Z. This is controlled by Finish bottom.
Tool selection, after roughing, the roughing tool is used to finish the slot. Use finish tool commands FeatureCAM to choose a separate finishing tool (that has same characteristics unless you override them).
Ramp on has the finish pass ramp into the material with an arc equal to a percentage of the tool diameter (see Ramp diameter). Not available for a Simple slot.
Finish passes and overlap makes the tool go around the slot a number of times set by Finish passes, and will overlap the starting point by an amount controlled by Finish overlap. Not available for a Simple slot.
Ramp off uses another arc of the same size as the ramp on to move the tool away from the finished wall. Not available for a Simple slot.
Retract removes the tool from the stock area and sets up for the next operation.
See also How slots are manufactured.