1. Select ONLY the text and/or vector objects you need to convert to a bitmap with a transparent background.  Go to: File > Export.

2. In the dialog box enable the ‘Selected only’ option and choose the ‘PNG’ file format.
3. Click on ‘Export’.

4. In the next window select the settings you prefer and click OK.

Tip provided by Silvio Gomes, CorelDRAW Master, Artist and Graphic Designer