Follow these steps to merge duplicate company records:
First, in your Companies tab, select the two records you would like to merge into one:
Next, click the orange Actions button and select "Merge Companies":
A modal box will appear where you will need to select one company as the "master record." The bottom company record will be the master, and data from the top record will be added to it. The top record will then be removed from the system.
To complete this process, click the "Merge Companies" button.