If you have a Gerber driver that makes the plotter look like another printer (to windows) you may "print" your design to the Gerber Printer.
If you have a Gerber plotter driver that Corel can see, you can send your design directly to the plotter from inside of CorelDRAW.
(Have you check the Gerber plotter website for drivers and/or utlities?)
If neither of these are available, then you can export your drawing to a *.PLT file. And then you can send the PLT file out the communications port that the plotter is connected to. (This is a form of HPGL/HPGL-2 plotter language.)
Note: the plotter(s) only handle vector objects. Some plotters are intellegent enough to recognize a special color as the countour line that is cut and ignores all else. Some plotters may interpret all colors as being available to cut all at once (instead of one color at a time).
I have been using CoCut as a "backend" to CorelDRAW for years. It's priced about in the same bracket as Corel products (unlike FlexiSign et al) and does the job. I drive a Summa D60, but CoCut will handle just about any plotter/cutter.
See http://www.cocut.com/index.dml for the latest version.
I, also, have CoCut that I use, now and then, with CorelDRAW. I have had this since Ver. 11 (both, CorelDRAW and CoCut versions). There are drivers for the Gerber systems, supplied with CoCut.
My methods, above, do not utlize any third party add-ons to cut from CorelDRAW, but do require you to take extra steps and try a little experimentation to get things right, whereas a product, such as CoCut, will get you up and cutting in no time.
FWIW: I also have a branded version of the Flexi sign cutting software and sometimes I export a design out of CorelDRAW and import it into the Flexi software for cutting on the plotter. The exact path I take to get from DRAW to cutting (CoCut or Flexi) depends upon the design and what I want to end up with.