Product: ImportOmatic API
Description: This solution describes the order of processing for ImportOmatic
Environment: Non-Hosted
Versions: 2.0 and higher

Answer:

Once:
BeforeImport

Each Row:
BeforeComputedColumns
BeforeDictionaries
AfterDictionaries
AfterConstituentOpen
AddressAdded (Constituent)
AfterProposalOpen
BeforeConstituentSave
AfterConstituentSave
AddressAdded (Individual)
BeforeIndividualRelationshipSave
AddressAdded (Individual)
BeforeOrganizationRelationshipSave
BeforeParticipantSave
AddressAdded (Participant Guest)
BeforeMembershipSave
(Split Gift Rows) BeforeComputedColumns
(Split Gift Rows) BeforeDictionaries
(Split Gift Rows) AfterDictionaries
BeforeGiftSave
AfterGiftSave
BeforeRowCommit
AfterRowCommit

Once:
AfterImport

Note: Some of these sections will repeat multiple times if you have more than one group of relationships/participant guests.