You can refresh temp-tables in the model from two sources.
Refreshing temp-tables from the database
When you right click a temp-table on the design canvas and select “Refresh from Database” the temp-table’s field definition will be compared to the current database structure allowing you to add new fields from the database to the temp-table or remove fields from the temp-table that have been removed from the database.
Refreshing temp-tables from the generated source code
The “Refresh from Include File” option on the temp-table’s context menu allows you to update the temp-table on the model with any changes you have manually made on the temp-table include file.
This includes adding new fields, changing existing fields or removing fields.