Ok I hope you will understand this. I just purchased the SOBI plugin and installed it. here are my structure.

Main category - ( show all listing -ex company A is listed)
-1st category
-1st sub category - ( show listing - company A is listed )

when I click the listing in the main category which is "Company A" the url is mydomain.com/companyA

but when I go to 1st sub category and click the "Company A" the url is mydomain/1st sub category/companyA

but they have the same content.. what I want to do is I want to have the same url of my main listing and the sub category listing which has the same content so it will not be duplicated.

is that possible ?

where is the support of this plugin??

Hello,

JoomSEF SOBI2 plugin creates URLs always based on original URL. This means that if non-SEO URLs for what you have as mydomain/1st sub category/companyA and mydomain/companyA are different (see it in URL editor/viewer) the resulting URL cannot be same.
The only way I see in such case would be creating a 301 redirect from one to another. But that would have to be done manually, which is probably not accpetable.