How to query on a custom property.
Solution
In ST9, a 'Custom File' property was added. When you select the 'Custom File' property in the Query dialog, an edit field becomes available where you can type in the property name. Then, you can enter the value that you will be searching for.
Notes and References
Hardware/Software Configuration
Platform: INTL64
OS: window
OS Version: n/a
Product: SOLID_EDGE
Application: ASSEMBLY
Version: V109.0
Function: TOOLS
Ref: 001-7794020