Batch for Transfering multiple DTS packages from one serve..

We create DTS packages on development server and try to move the
packages to test servers.
We first extract the packages and save them as some kinds of binary
files.
When we are importing these packages to another servers we have to
rename them according to the server name.

Now we can only import each package one by one from the saved file. We
then have to enter username and password for each package.

I am looking for ways to be able to ease our work and let us to import
these packages by using either a batch file that is flexible enough to
let us alter the packages name and owner and stuff.

Please help me with this issue or direct me to some related posts or
articles.

Much appreciated.

Thank you.