i have an requirement i.e. from author user will be provided an option to publish a page from author to either publish1 or publish2 ar a time, please let me know if we can provide an option i.e. 'publish to publish1' and 'publish to publish2' so that there will not be any relation between publish1 and publish 2 during publishing.
please let me know if any more information required.
One alternative is to change the trigger on publish2 (assuming that is the preview server) to be "On Modification". Then when any page or asset is changed - it is automatically replicated to the preview publisher with no additional effort by the author.
But if you use this feature - You probably also want to check "No Version" as well as "No Status Update" as well. Otherwise - you may be deceived into believing items were activated to your production publisher while they actually were not.