How can I change the table structure in the merged copy?

It can be divided into the following situations:
1. Modify the published columns. On the properties page of the published Project, select filter columns and add or delete columns. This feature is automatically released without affecting other data.
2. Add a published table without filtering data. You can add a table to the Publishing Database, and select a published Project on the publishing project properties page to add a project. Here, you need to re-execute the snapshot without affecting the data.
3. Add a published table and filter data, which is similar to 2, but all the structures and data are automatically re-synchronized. If data is not synchronized before synchronization, it will be lost.
4. to delete a table, you need to delete the table and release it again.