lost subtype when register feature from file geodatabase

Hi all,
Have any one can help me with below issue:
I have *.gdb file with Khuchucnangp feature.When I open it by ArcGis, I can see have a domain and many other subtypes that are relationship with the domain values. But when I register feature, only 1 property and 1 subtype can be listed. Why and how can I get all the subtypes.
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