I used to use Foxpro to enter a transactional data for records on a master file. Suppose for example you have a master file for patients whose name, address, date of birth, etc were already recorded. But suppose a patient from this master file has to visit the same clinic at different times in a month or a week or as he/she needs. When this patient visits the clinic, his date of visit, reason for visit, medications prescribed and so on. On each visit these changing info will have to be registered for each of his/her visit. These registrations are called transaction data and there must be a relational transaction file for this purpose. is this possible in Drupal?. Thanks for any information on this.