how to create graphic element (motor-tank-valve)
Please confirm whether the HMI platform is 800xA or PPB or someother hmi?.
Secondly , Checkout how many instances of such symbol you wanted whether is for single , double or multiple instances ?. If it is for one or two , directly expressions can be written in graphic display else a common template symbol to be created in graphic structure / objecttype structure to be used for many instance , this applicable for 800xA only.
In 800xA , There are standard elements where you can find these basic elements can be used for single or multiple instance as part of installation...
There are different type of configuration a Motor , Valve or Tank level can be made, so all the requirements to be considered upon , Like how it should behave , no of tags /field information associated with it.
e.g. A valve status can be shown with single tag , incase of solenoid based operated during energizing or two tags for opening & closing ,etc....