Hi,
Hope i understand you question correctly here is what i do:

1. Create a drawing (just with a couple of lines drew a box)
2. Added a table with two columns
3. Select the drawing, important here is not to select the container which holds the drawing but actually select the drawing itself. You should see 6 dots appear around your drawing.
4. Cut the drawing (Ctrl-X or Cut from the ribbon)
5. Click in the table column of your choice so a cursor is blinking on the right position
6. Paste the drawing. Test it by writing some text in textbox.

hth