Is there a way to change symbology for multiple layers in arcmap or arc catalog. I want to change the symbology of multiple layers at once.
Edit You can use this script provided by ESRI to complete the task at hand (same idea as below):
Or extend this in the form of standalone scripting (think IDLE):
In essence, you create a symbology layer (in_symbology_layer) that you maintain with respect to design/style. Then you copy that layers symbology on to each of your other layers as listed in your table of contents.
You can use a style from a current layer in your table of contents/layer list and apply it to your other layers.
For each subsequent layer (below your intended style layer) > right click > properties > symbology > import style from other layer