Groovy to update an Alias based on text account?

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Hi, has anyone written Groovy to update an alias of a member from one dimension based on text entered into a text account?  I've read a lot of public Groovy how-to's but haven't been able to put it all together for something like this.

The vision is something like this:

1) user selects a member from a page selection i.e. department 

2) accounts on the rows one of which is a  text account i.e. department alias

3) groovy script runs on save to update the alias for the department selected in the page based on the text data stored in the "department alias" account