I have made a custom field, practices, for our library, which is in PO1.
Users in PO2 and PO3 cannot add the pratices column to their view of the
default library, as it doesn't show up in the 'more columns' list.
Users in PO1 can find and add the practices column.

All users can do a find by example, and choose the practices field there.

Is there a way to get the practices column to show up for the users in
PO2 and PO3?