You can move properties from one company to another; here's a few steps on how to make those changes:
Go to the company you want to move the properties from.
Select the checkboxes to the left of each property you wish to move.
Click the "copy checked properties and move to.." link.
Navigate to the Company you wish to move the properties to and you will see a link named "Paste properties to this company".
You will notice there is a note stamped in each company record to let other users know where the properties have gone in case they go looking for it and can't find it.