During proposal line item creation, a consultant needs to able to select a value for...

When creating a proposal line item that includes a picklist type attribute, the consultant must ensure the attribute is "Run-time Configurable" (B) during its assignment to the parent object type. This non-overridable behavior allows the attribute's value to be selected dynamically at the time of proposal line item creation, providing the necessary flexibility to adapt to varying proposal requirements.References:

https://help.salesforce.com/

https://www.salesforce.com/products/media-cloud/overview/