if you want to insert into the drawing the dumb table not linked to drawing model, then:
This is a solution to my original question. I thought I would share it.
If I have a series of x and y coordinates for hole positions in Excel and I want to import them into a part model;
1. Open the part model.
2. Insert a dummy hole.
3. Pattern the hole (create at least one more hole for a total of 2).
4. Edit the pattern and change to 'Table Pattern'.
5. Edit the table.
6. Save the table with the CREO '.ptb' suffix (e.g. holes.ptb).
7. Retrieve the .ptb file and open in Notepad.
8. Cut and paste the x and y coordinates from Excel into the .ptb file you just opened in Notepad. You must format the columns in Excel to mimic the format in the ptb file before cutting and pasting. Save this file and close it.
9. Go back to CREO and Edit the table pattern.
10. Click 'File' > 'Read' > enter the filename of the hole table discussed above (e.g. holes.ptb).
11. Click 'OK'
12. Save and Exit the hole table editor and click the check mark.
13. The holes should show up in your part.
14. Note: you made need to toggle sign conventions on the x and y values to coincide with the convention used by CREO. This will be readily evident if the holes do not fall into the field of the part as expected.