Should I create multiple DTOs for the same entity?
If I create only one DTO, will it be used for all of the above actions?
Not unless you write code to make that happen. You could have a single DTO for any number of actions if you wanted, but Spring does not impose that. Creating a DTO will not make it be used for all of the actions.
Should I create a DTO for each of those actions?
Generally, no.