Define your own properties

You can control thread count, Ramp up – Ramp down and duration etc., with out actually opening the script from GUI by defining your own properties in the JMeter bin folder
1. Add Property File Reader plug in to your JMeter. (Link: )
2. Put this plug-in under lib/ext folder of JMeter
3. Define your own properties in the bin folder and make sure it’s name ends with .properties

Add Property File Reader(Thread group> Config Elements> Property File Reader) to your test plan and give the path of property file which you define.

Now get the values of the variables which you defined in the properties file with a help of property function ${__(name,)}