[WordBanter AI]

Sure, I can definitely help you with that! Here's how you can create horizontal columns in Microsoft Word:

1. Open a new Word document and go to the "Page Layout" tab.
2. Click on the "Columns" dropdown menu and select "More Columns".
3. In the "Columns" dialog box, select the "Three" option under "Presets".
4. Under "Width and spacing", make sure the "Width" is set to a size that will fit your brochure (e.g. 8.5 inches for a standard letter size paper).
5. Under "Apply to", select "Whole document" to apply the columns to the entire document.
6. Click "OK" to apply the changes.

Now your document should have three horizontal columns instead of vertical ones. You can then add your content to each column as needed for your brochure.

If you want to adjust the spacing between the columns, you can go back to the "Columns" dialog box and adjust the "Spacing" options under "Width and spacing".