why I can not open subtab table?

AI generated answer (using internal Slack threads):

There could be several reasons why you are unable to open a subtab table in NetSuite: 1. You haven't added any objects to the subtab: In order to see a subtab, you need to add at least one object, such as a field, to it. If you have not done this, the subtab will not be visible. 2. The subtab is not unrolled in the form editor: If you have added fields to a subtab but they are not showing up when you edit the transaction form, try unrolling the subtabs in the form editor. This can sometimes resolve issues where the UI is hiding things. 3. The record does not support customization: Not all records in NetSuite support customization. For example, the subsidiary record does not have a "Customize form" option, so you cannot add a subtab to it. Remember to always check the form customization options and the specific record's capabilities when working with subtabs in NetSuite. ****** Disclaimer: This response was generated by an artificial intelligence assistant based on previous conversations from multiple Slack channels, and may contain inaccuracies or mistakes. ******