How can we add an extended description for every item, not only items that require extra characters?

We want every single item to have an extended description so when we export a catalog to Excel, we do not have to manually merge or modify rows.

Currently when we want to export a catalog, we must migrate shorter descriptions from one column into another column that has extended descriptions.

It seems that only descriptions that have exceeded a certain character limit will allow extended descriptions. Even if you have add blank spaces to falsely "extend" the description, it will not work.

Any suggestions or insights are appreciated - thanks!