Hi Chad,
I assume that you had already defined the PS table yourself, since it doesn't exist in my catalog. I am at the same point as you, just starting with AE 2004 with a new project. I've made a PS and used a name like HPS1_001.dwg.
Here is the pertinent info from the 'online' manual:
(It is referring to how Catalog look-up deals with the block name and the search for the relavant table)
"If the block name is 8 characters or more, it starts lopping characters off of the end of the block name and looks for a table name match. This continues until a match is found or there are less than 8 characters remaining in the truncated block name. Example: full block name is "HCR1MCTRL_W_SUPPR". AutoCAD Electrical first checks for a parts table "CR1MCTRL_W_SUPPR". If not found, it starts lopping characters off of the end of the block name and looks for a table name match. Table names that it would look for in sequence would be "CR1MCTRL_W_SUPP", "CR1MCTRL_W_SUP", ... until it got down to "CR1MCTR". If no match on this last table name, AutoCAD Electrical finally checks for table "CR" (the first two characters of the block name)"
So what is happening with our block names is that it first looks for a table called "PS1_001" in my case, and if my block name happened to be longer than 8 chars, it truncates a character, and looks again. Finally, it looks for a 'PS' table. Since that table exists in your catalog, it goes ahead and pulls up that table. So if you manually create a table named PSU, and name your block something like "HPSU_001.dwg", then it will pull up that table when you do a Catalog look-up.
- Jay