BLENDER: Start a new file and prepare the measurement units

Starting a new file
Open your Blender software.

It should start with a new empty file.

Select all objects by pressing A, you may have to press it twice. It should show the objects marked in orange.

Press delete key and click OK on the box to proceed.

Prepare the measurement units
On the right-side panel, look up the Scene tab.

Below the Units, click on the drop down menu and choose Centimeters

Length should be Metric.

Unit scale should read 0.01

Problem with cut off view in the 3d view
When you are making large items using this measurement unit you may experience problems with cut off grid and object. Press N to open the Properties panel.

Look up the View part.

In the Clip box, type 20m (or more if you like) in the End box and push enter.