# Multi-Site Manager

Advanced Categories works in an MSM install, however, there are some things to be aware of.

* ExpressionEngine lets you share custom fields across multiple sites.
* ExpressionEngine does not let you share category groups across sites.

For those reasons, and based on what Advanced Categories is intended to do, you can not share an Advanced Category field across multiple sites. You will need to make an Advanced Category field unique to each MSM site you are running.
