Can someone help me how to install Documentum webtop in our local ?

Deploying locally is really no different that installing on the server:

1. Choose a supported application server version and set it up (I will use Tomcat as my example)
2. Do one of the following:
   1. Deploy the webtop.war directly to the application server directly
      1. Upon startup the webtop.war will be extracted, you will need to update dfc.properties and restart the app server
   2. Unzip the webtop.war file to webtop folder
      1. Edit the dfc.properties
   3. If you are running an app server in a development tool (like IntelliJ or Eclipse), set up the app server runtime, edit any configuration files for compatibility in the runtime and setup your development environment.
      1. You can extract/put the entire webtop application as your development output, or you can deploy webtop to the integrated application server and choose to output your libraries/other folders on top of what already exists (ensuring not to include the webtp app in your clean scripts).

Development environments take a bit more but that should hopefully get you started. The installation guide should cover all the pre-requisites and most of the above.