Cv website development problems
There are a number of ways you could do it, depending on how friendly you want the ui to be and how comfortable you are customising drupal. 

I would look at the Field Collection module - http://drupal.org/project/field_collection. It should let you create a group of fields that can be treated as a single field. 

ie you could create an 'Experience' field collection consisting of Title, Experience, Duration, Summary and whatever else you need. Then the end user should be able to add multiples of these if you set the field to allow multiple values.

I am saying should because I haven't directly used this module myself, in a similar situation I have created a custom form widget containing the multiple elements. Thats is potentially a more complicated exercise. You could see an example of what might be required there in the Examples for Developers module : http://drupal.org/project/examples