Working with related tables and files > Filtering records in portals
Filtering records in portals
By filtering portal records, you can display different sets of records in a portal.
1. Double-click the portal.
2. In the Portal Setup dialog box, select Filter portal records.
3. Define a calculation that determines which portal records will be displayed.
For example, if you are in an Invoices layout, in a portal that shows product records from a LineItems table and want to display just the products with quantities greater than or equal to one, use the formula If (LineItems::Quantity < 1; 0; 1).
4. Click OK.
Important  The results of summary fields, calculations, and find requests are based on the full set of related records, not just the records in a portal that are filtered. For example, if a portal is displaying a filtered subset of records, and there is a Total of summary field outside the portal summarizing these records, the summary field will total all related records, not just the displayed records.
If filtering is enabled, in Layout mode you see Filter in the lower-left corner of the portal.
Filtering records is intended for display purposes only, not for security purposes.
Filtering records is performed before sorting records.
The portal filter calculation will evaluate the same as a field calculated in a portal row.
Related topics 
Creating portals to display related records