Import calculated fields for one 1 project even though multiple are imported

I have a custom field that I need to import but it only exists in one of the projects that are imported for my account. How can I code for the custom field to account for the field not existing in the other projects?

issue.fields.customfield_10405.value
**this field only exists in Project key=“PMO”

Hi @Taylor_Quinn ,

Please import this custom field.
​It will be imported for the projects and issues where it is populated.
​However, for the projects and issues where this field is not present, it will be imported as (none) for a dimension member or a blank value for measure or property.

​Regards,
​Oskars / support@eazyBI.com