sequential execution

There are a few approaches you could take, one would require FME Flow and using an automation. Each reader/writer pair (and any logic) would be in their own workspace. Then using an automation you’d chain each of the workspaces together so once the first one has completed, the second one begins.

Another approach, that will work across both Form and Flow, is to make use of feature readers and feature writers. The feature reader allows a feature to trigger a read, and the feature writer allows you to continue processing after features have been written

Thank you only with Form and with one workbench what is the process ?

tks 

Use FeatureReaders and FeatureWriters.

Just make sure that only 1 feature enters a FeatureReader, as the FeatureReader performs its action once for every feature.

Thank you very much, I'll try it.

In this same process, ​ the first layer is incremented under PostgreSQL with an incremental ID. I then want to retrieve the ID of the first PostgreSQL layer to perform a join to my third layer. How do I retrieve this ID knowing that it is automatically created under PostgreSQL?

You can use SQLExecutor to retrieve the ID.

Something like

select max(ID) from myTable

Thank you, In the end I used Databasejoiner