Take a look at the Conditional Fields module. You could make some fields dependent on one checkbox selection and other fields dependent on a second checkbox selection.
Define dependencies between fields based on their states and values.
Conditional Fields for Drupal 7 is an user interface to the new States API, plus the ability to modify fields appearance and behavior on certain conditions when viewing content.
Description
Conditional Fields allows you to manage sets of dependencies between fields. When a field is “dependent”, it will only be available for editing and displayed if the state of the “dependee” field matches the right condition. When editing a node (or any other entity type that supports fields, like users and categories), the dependent fields are dynamically modified with the States API.
A simple use case would be defining a custom “Article teaser" field that is shown only if a "Has teaser" checkbox is checked, but much more complex options are available.
