You can write text in columns using any one of the following options:
Set the page format to columns
Insert a section with columns
Text fills all columns to the same height
Text fills first column, then flows into next column
Use a multi-column table
Use text frames or linked text frames
Each option has its own advantages and disadvantages.
Set the page format to columns
This looks like the most obvious choice if you need columns on several pages.
To apply columns to the current page style:
Choose Format – Page – Columns.
This however changes the current page style, which most often will be the "Default" page style. If you want some other pages without columns, you must know or learn how to apply different page styles in the same document.
To define a new page style with columns:
Choose Format – Styles and Formatting to open the Styles and Formatting window.
Click the Page Styles button in the Styles and Formatting window.
Right-click the Default entry to open the context menu.
Choose New...
In the Page Style dialog, type the name of your new page style, for example, Two Columns.
In the Next Style list box, select the Two Columns style, or the Default style.
Choosing the same style as next style will continue this page style for the following pages.
Choosing another style as next style will define the current page style to span one page only.
On the Columns tab, select the columns options. Click OK.
Now you can apply the new Two Columns style to the current page range by double-clicking the Two Columns name in the Styles and Formatting window.
For a definition of page ranges, see "The scope of page ranges" in the blog entry http://blogs.sun.com/oootnt/entry/changing_page_orientation
You see, the obvious and simple way to apply columns is simple only if you want to apply columns to the whole document. Otherwise it turns out to become a difficult multi step instruction. Fortunately, there are other ways to get columns that are much simpler to apply.
Insert a section with columns
To apply columns to a part of a page:
Choose Insert – Section.
Click the Columns tab page and set the options. Click Insert.
The checkbox "Evenly distribute contents to all columns" is enabled by default. The text will flow into the columns so that they all are filled to the same height. The whole section changes its height accordingly.
If you disable the checkbox, text flows into the first column of the section. The section grows down until it reaches the lower page margin. Only then the text will flow into the next column.
You can press the column break key, Ctrl+Shift+Return, to manually jump to the next column. This does the same for columns that the page break key, Ctrl+Return, does for pages.
Use a multi-column table
For some applications you may prefer to insert a multi-column table and enter your text into the cells.
The table offers some formatting features that you may prefer. For example, it is easy to drag-and-drop the cell and table borders to resize the columns. Different backgrounds to the cells are possible, and other options.
Use text frames or linked text frames
This is another option that can be helpful for newsletters, for example. You can read about linked frames in this blog entry: http://blogs.sun.com/oootnt/entry/text_boxes_in_writer_documents and of course the installed application Help has some helpful advice, too.
Tip: before you decide which method to use for your columns in a long document, you may want to test the results of all output options first. Some methods for columns will export to PDF or to HTML better than others.

