Hi Shane,
For mvParts, ducts, pipes, cable trays, conduit, and associated fittings,
there is a parameter added at runtime which tracks if a custom size has been
added to a part. If you choose a part from the catalog this value is always
false (not a custom size). If you reply 'yes' to one of the prompts asking
if you want to create a custom size, because the size is not found, this
parameter is set to true (yes, this is a custom size).
The automatic property "Custom" reads and reports this parameters. The
intended usage for scheduling purposes is to use the automatic "Custom"
property which finds and reports the internal customSize parameter value.
If you need the actual parameter name, I believe it is "CSP".
Craig Storms
Developer