How to deploy portlets to Liferay

I make first a .war file let's say a portlet of name your_file.war.I wanna have it running on a TOMCAT domain under Liferay portal.
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To Use Liferay UI (User Interface). Simply log in with a user allowed to install new portlets and go to Control Panel > Plugin Installation
You will find there a "Install More Portlets" button. Click on it. Then Click on "Upload FIle"
There you have several options:

• one is to use a local file and upload it this way to the server,
• an other is download file, when you know where the porlet war file lies on the net,
• and the default is to use Liferay repository, which means you are going to install a portlet part of one of the suggested online repositories.