Polaris added in 7.5 the ability to support pick areas. Libraries use these for drive-up windows, lockers, schools, etc. This support was also added to the Polaris API at the same time.
However, Bibliocommons doesn’t support this feature. If you use Bibliocommons and Polaris, please consider voting up this idea on their idea portal: BiblioCommons Product Ideas Portal
If Bibliocommons added support for this, it would also allow Bibliocommons patrons to change their pickup location for held items in Bibliocommons.