In our project after a transaction the application displays a message "sale order created MO001" in this string i have to use only the number MO001 and has to proceed to next transaction how to do this

NOTE : [This question was asked by feroz]

In this case, First of all, you will need to split the string. i.e. get the text you need from it. To do this, you may need a "Right(x,y) Function"
Then You will need to use an Output Parameter to get the Mo001 and hold it (i.e. if you are using Quality Center or TD along with your test) If not, you may just output the data in a datatable.
Then you load the next transaction and use the stored data by calling an input parameter.