Insert a Dropdown List Content Control in each cell of the column and add the list of categories to it.
- If you don't have the Developer tab displayed in your copy of desktop Word, go to File > Options > Customize Ribbon and add it.
- Click in the first cell of the column.
- On the Developer tab, click the Drop-Down List Content Control button to insert a control in the cell.
- Enter a title for the control (this will appear above the control when it's selected) and/or a Tag value (this is invisible to the user but can be used by macros to access the control).
- If you don't want users to be able to enter a category that doesn't appear in the list, check the box for "Contents cannot be edited".
- Click the Add button and enter a display name (this will appear in the dropdown). The Value box will default to the same text as the display name, but you can change it if you want -- the value will be accessible to macros for calculations if necessary. Repeat this step for each additional category.
- When the list is complete, click OK.
- If the lists in all the cells of the column should be the same, you can copy the first one and paste it into the other cells; or you can supply a different list for some or all of the other cells.