dynamic display of a running process?

I am writing a script and according to that when I run it certain info will be displayed on the output screen. for example say the **constant data** displayed is: my name is mukesh. i am 27 years old unix version 7.2.3.0 but along with the above display something else is also need to be displayed(**varying data**) I.e Process A is starting Process A is running Process A is completed. but I don't want the above display. I want Process A is starting to be cleared from screen and replaced by Process A is running and then by Process A is completed. I am not very keen to use clear as it will remove the whole screen containing the **constant data** also. and also because the constant data takes a lot of time to process and to be displayed on the screen.