Charity Eligibility, formerly known as NonProfit Central, is a legacy product that is no longer available from Blackbaud.  We will be removing this option from The Raiser's Edge in a future patch or release.

Currently, it is accessible from a Constituent record and from Web Services:

Constituent Record: 
Charity Eligibility drop-down on a constituent record

Web Services: 
Charity Eligibility option in Web Services

As the Charity Eligibility option is no longer offered by Blackbaud, we will be removing this from The Raiser's Edge in a future patch or release.