How to add support to parts of the print, but not others?

I need to print a file that is a nightmare to clean the support material out of. Is there a way to add support to only certain parts of the print and not others?

Use MeshMixer to generate your own custom support.

I sometimes draw my own support in CAD software.

I haven't had the time to test it yet, but version 1.1.0 has the option to use another object to define printing parameters of the actual printing part, I don't know if enabling or disabling bridges can be done that way.

vetteguy112233, can you share your model and describe where you wouldn't put support?
I'm going to release 1.1.2 soon which will carry a great reduction of useless support material thanks to a new algorithm.
Thanks for helping.

Here's one I'm trying to print and wasting a lot of time and plastic on. As you can see, the square holes don't need support, but there is a few obvious bits that can't do without. So... With support, the square holes are blocked and there is a terrible mess of cleaning to do around the little "shelves" and without support, there's a bit missing (can you guess what bit )?

I hope this is a good sample to help improvement and also hope someone can help with the selective support thing so I can get my quad fame printed.

B11TME, that is a perfect candidate for drawing your own support. If you can draw that frame you can draw the support. Just leave it 1-2 layers lower than the part and that way it will lightly attach and be removable. Sound is working on support that may be settable for where it is but not here yet.