When you make a summary from a dataset and use a group the newly created table is linked to the original table. For my calculations this is very handy.
1. I wonder if it possible to link data tables my self without the summary function?
When the original table and the summary table are saved into a project the link seems to disappear when the project is reopened.
2. Can I do something to keep the link working?
In the documentation the only reference for linking was found under the summary subject.
It's possible to link 2 tables through the use of a calculated column and some JSL code. See pages 9-12 of the attached presentation, which I showed at last year's Discovery Summit. There's also a technique showing how to make a table cell act like a hyperlink on page 8.