Hello Jubin,
Your best bet to learn abt ASE is through ASE online documentation.
Proxy tables are used in (Component Integration Services)CIS functionality.
Here is a link to CIS. You can choose the section in the documentation understanding Component Integration Services for your related ASE version.
Proxytables are the key to location transparency. A proxytable is a
local table containing metadata which points to a remote object. For information about
remote objects, see “Object types”.
The remote table is mapped to the proxytable to make it appear as if it were a local table.
The complete description of how to do this is in Chapter 3, “SQL Reference.”
Hope this helps!
-Gek