Helo I have base system 4.0.0.0 installed.
I m using linux operating system.
right now I have following packages are installed

ADMIN-4.0.0.0
DBASE-4.0.0.0

I want to make my system 4.1.0.0

for this I upgrade the above packages to ADMIN-4.1.0.0 and DBASE-4.1.0.0

now I want that when Uninstall 4.1.0.0 then I got the my base system as
4.0.0.0.
how do I achieve this.

If I erase the upgraded above packages then how i got the original packages

Regards,
Amit

To help you i just looked in "man rpm" and found "--oldpackage" option provides you such functionality. Following sequence works for me

[root@sumit /root]# rpm -q procps
procps-2.0.11-7
[root@sumit /root]# rpm -U procps-2.0.6-5.i386.rpm
warning: procps-2.0.6-5.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e
package procps-2.0.11-7 (which is newer than procps-2.0.6-5) is already installed
[root@sumit /root]# rpm -U --oldpackage procps-2.0.6-5.i386.rpm
warning: procps-2.0.6-5.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e
[root@sumit /root]#

It's not really clear what are these packages for, I'm unaware of their names, nor you have mentioned your specific Linux distro. Generally, RPM packages are upgraded with -Uvh flags.