This is very simple steps involved as you mentioned you have already installed JAVAEE plugin so the first step for you is go to Windows->Show View->Server
in add select the AppacheTOMcat and select the tomcat version you have downloaded and set the path and start the server after that.
Most of the time when we download tomcat and extract the file a folder will be created:
C:\Program Files\apache-tomcat-9.0.1-windows-x64
Inside that actual tomcat folder will be there:
C:\Program Files\apache-tomcat-9.0.1-windows-x64\apache-tomcat-9.0.1
so while selecting you need to select inner folder:
C:\Program Files\apache-tomcat-9.0.1-windows-x64\apache-tomcat-9.0.1
instead of the outer.
There are different eclipse plugins available to manage Tomcat server and create war file.
For example you can use tomcatPlugin. It permits to start/stop and build the war simply. You can read this tutorial.
The Java EE version of Eclipse is not installed, insted a standard SDK version is installed.
You can go to Help > Install New Software then select the Eclipse site from the dropdown (Helios, Kepler depending upon your revision). Then select the option that shows Java EE. Restart Eclipse and you should see the Server list, such as Apache, Oracle, IBM etc.
Right Click on the server tab, go for NEW-> Server. then choose recent version of tomcat server. Click on next, and then give path for your tomcat server.(You can download tomcat server from this link https://tomcat.apache.org/download-80.cgi#8.5.32). Click on finish.
You can start your server now..!!
If by mistake, you have deleted your Tomcat Server and Eclipse is not showing more options (Next button will be inactive) then in this case follow the bellow steps:
First remove the two files from the following path:
And that two files are :
After deleting/removing the above two files from the workspace, Restart the Eclipse IDE.
Change to the Server View, Right Click 'New', Window 'Define a New Server' is shown, --> Select the Apache Folder, choose Tomcat-Version
Browse to the unzipped 'Apache-Tomcat folder', choose the second level
Now you are able to add/configure your new Tomcat Server. (Now you will see the 'Next' button will become active, and you can then follow the normal instructions)
Source: Stackoverflow.com