One of the requirements when exporting characters for a typeface in CorelDRAW is that each letter or symbol must be a single object -- not GROUPED (Control+G). One way to do this is to COMBINE (Control+L) all your objects. But the results of combining 2 or more objects might yield 'holes' or other anomalies that you don't want. Follow the examples below to see the differences and how to overcome the limitations of the COMBINE option.
Specific commands apply to CorelDRAW 7 but the techniques can apply to other similar drawing programs as well.