From ACT Wiki
1. Corporate treasury.
A profit centre treasury is one which is authorised to actively create market positions with a view to earning profits, as well as hedging.
Profit centre treasuries are normally associated with a high degree of centralisation of treasury authority, compared with treasuries organised as cost centres, or cost saving centres.
2. Management accounting.
More broadly, a profit centre is any part of an organisation to which revenues and costs may be allocated for accounting purposes, resulting in the calculation of a profit or loss for the profit centre.