When you fill a curtain wall cell with an infill that contains an object, such as a door or window, you can edit that object independently from the curtain wall. For example, you can select a door from a curtain wall and edit its properties. You can edit the anchor settings for the door to change the orientation of the door and the alignment or offset of the door in relation to the curtain wall.
You can also move objects from one cell to another or release the object anchor so that the object moves independently of the curtain wall.
When you move or release an object or edit its properties, you are creating a variation from the infill cell assignment for the curtain wall style. By default, these variations (except release) are allowed to persist in the drawing when you reapply the style to a curtain wall. However, if you want these variations to be overridden when you reapply a curtain wall style, turn off the Allow Variation from Infill Element Definition option on the Anchor worksheet of the Properties palette of the object. This option is set on a per object basis.