Mach3 mill beginers problems

[RICH]

I have never used that old version of Mach and the LC manual does not even address it.
Thus, whatever you can find posted or if another user replies, that will probably be the extent of any help
your going to get with the old versions.

To remove the "black colored portion"  and leave the read colored portion in place the drawing would need to be done
somewhat differently, or, select all red colored items and do maybe similar /pocketing  to what is shown for raised text
( tutorial #4 in the manual) . Then to drill the holes you would just draw small circles and select all of them and define them as a drilling operation.
You will need a pro version of LC to do it.

Sorry i could not be of more help,
RICH