You need to put the shared content in a separate artifact because there is no way to link part of the artifact. Assuming the "table" that you mention is in a single text artifact, and let's call them "Table A" and "Table B" respectively in modules A and B. Follow these steps.
1. Open "Table B" and put it in edit mode.
2. Select the text in the cell intended for sharing and select "Save Select as New Artifact and Insert".
3. Give a name to the new artifact and click OK. You will notice that the cell looks a bit different from the original now.
4. Save the changes to "Table B".
5. Open "Table A" and put it in edit mode.
6. Put the cursor in the intended cell and select "Insert Artifact".
7. Locate the newly created artifact at step 3 and click OK.
8. Save changes to "Table A".

Note that there is another option which is "Add Link", and it is displayed quite differently from "Insert Artifact" (name vs content). Give it a try and see which one fits your requirements.