There are three kinds of actions:

non-reusable action?an action that can be called only in

the test with which it is stored, and can be called only

once.

reusable action?an action that can be called multiple times

by the test with which it is stored (the local test) as

well as by other tests.

external action?a reusable action stored with another test.

External actions are read-only in the calling test, but you

can choose to use a local, editable copy of the Data Table

information for the external action.

Three types of actions are there :
 1.reuabale action.
 2.non reusbale action.
 3.external action
   default one is the non resubale action.

I believe there are only 2 types of action

1) Non reusable action
2) Reusable action

Any reusable action can be called from another test