Why create one? _ "Re_inventing the wheel", is no fun. If you work for a single organisation it's likely that your templates could last a long, long time with no need to go back to the design board every time you are asked to create a new manual or user guide. When you work for yourself it's a great way to show clients that you have the skills they are looking for without breaking any confidentiality clauses with your existing clients, and with just a little bit of luck they'll adopt your method of working so you can continue to recycle your past efforts too.
If you look around, you'll notice that everything is labeled. From a small jar to a large office desk, each and every item is bound to have at least one label. Labeling things is useful, easy and practical, and the applications are virtually endless. You can find a wide variety of labels available on the market, in different shapes and sizes, styles, designs, colors, materials, templates and so on.