How to create table and modify table in database by linq2db, FluentMigrator ?

I want to know the flow to create migration in the project (v4.3)

I create a new entity for a new table and new SchemaMigrationTest call function Up(), it creates a new table in the database. I'm not sure this way is correct because I see the date in the old SchemaMigration, I guess it's auto-generate
after that, I add a new property in entity class and create new SchemaMigration for the update table but it does not work.
I hope any people support this problem
best regards

Did you read this?

https://docs.nopcommerce.com/en/developer/tutorials/update-existing-entity.html

And this link
https://docs.nopcommerce.com/en/developer/tutorials/migrations.html