Assign from catalog -add new column ?

Thanks for posting on the forum!

The manufacturer column should be there.  It was probably hidden by mistake.  To show it back:

- Click any column header to select the column (for example, 'Description' column header) 

- Click 'Home/Show hidden columns'

- All hidden column will be shown, although greyed out.  Select the header of the column you wish to show (in your case 'Manufacturer'), and click 'Home/Show column'

- The column should not be greyed out anymore.

- Click 'Home/Show hidden columns' again to deactivate it.

At this point your manufacturer column should be back.

Let us know if it worked out for you!