For example, design strip settings, design rules, or calc options. Is there a way to change their default settings so I don't have to change them every time I create a new file?
Sure, set up a file the way you like and then save it as a template. See also: https://communities.bentley.com/products/ram-staad/w/structural_analysis_and_design__wiki/2057/ram-concept-files-faq
Answer Verified By: snipit
Thank you very much!. However, when I opened a new file with this template, once I import in a slab from .rss model, those existing settings are gone. Anyway I can fix this?
Regretfully no, direct imports from RAM SS or ISM are not built on user templates. We have had that request before (PRODUCT BACKLOG ITEM 568574 Concept Templates - New files imported from ISM or RAM SS with user template)