Merging Numeric Attributes
To merge two numeric attributes with the same dimension into a single attribute:
1. In the Attributes pane, select the two numeric attributes you want to merge.
2. Right-click on one of the attributes and choose Merge from the context menu, or choose Attributes ® Merge from the main menu to open the Merge Numeric Attributes dialog shown in the figure below.

MDM populates the dialog with the values and option settings from each of the two selected text attributes.
3. Edit the Name, Definition, and Alias properties for the merged attribute.
4. Select an image and/or eliminate conflicts for the Attribute Image property.
5. For those that are not disabled, specify settings for each of the ratings.
6. Specify the settings for the Default Unit, the number of Decimal Places, and the Show Fractions option.
7. If it is not disabled, specify the setting for the Multi-valued option.
8. Click OK when you are done to close the Merge Numeric Attributes dialog.
MDM merges the two selected attributes and all links to them.

The Merge Numeric Attributes dialog is identical to the Attribute Detail tab for numeric attributes, except that the Dimension property cannot be edited.