Data from a table in another file is updated or not updated by the same rules as a table in the same file. There are two basic methods for linking to related data. One option copies the data from the related table to a field in the other table. This data will not automatically update when data in the original table is modified. The other option is a dynamic link to the data via an unstored calculation field or by the simple expedient of putting a field from Table 1 on a layout based on the related table 2. In this second case, modifying the data in Table 1 will automatically update the data shown in data 2.