Hi Filemaker Geeks! I am working on a project and planning to use one file for each table. Then I put all the logic and layouts in one file. But some calculation fields involve several tables, i.e., several files. What is the best practice for this? I understand that I cannot put these fields in the logic file. So that means the only option is to still build some relationships in the data files. Any other ideas or suggestions? Thanks in advance!