To use something other than the standard data types when creating custom fields, you
can create your own custom data types.
What you should know
Custom data types define a list of values based on a standard data type. Custom data types
appear in a drop-down list in the Custom fields tab of the entity’s configuration
page.
Procedure
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Open the System task and click the General
settings view.
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On the Custom fields page, click the Custom data types
tab.
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Click at the bottom of the custom data type
list.
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On the Edit custom data type page, enter the
Name, Description, and
Type for your custom data type, and click
Next.
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On the Data entry page, enter a value in the
Value field and click .
The entered value is added to the enumerated list.
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Define other possible values for this data type.
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When you are finished, click Next, Next,
and Close.