Need Help Flexi fill plot issue

Not sure I fully understand but if I do, I think you need to "uncompound" the parts of the letters you want filled in. Compound just those parts and fill them in the color you want. You will also need to compound the outline and inline around the letters so it doesn't fill in holes in the letters.

 

I think you would have to fill the objects you want filled with pattern fills. You can use the stock ones in the palette or create your own. You may have to create one with lines so close together they appear to fill in the object.

 

Actually tried this and it doesn't work. Best I could come up with is taking the objects you want filled, then select Effects>Stripe and making it several stripes very close together. That should then plot and 'appear' solid.