Hi Celeste, thanks for contacting us.
1) the content is not displayed in scraper’s visual editor if it’s loaded via Ajax. But still it might be possible to scrape the content. We’ll need to check the source site if it’s possible or not.
2) category – you can select it to Post Category field. For custom variables, you need to select/fill respective custom variable. These variables should be available in ‘Type’ dropdown box – https://www.screencast.com/t/rqGzsQsFG0m
3) already imported data will not be deleted, only the task is deleted.
Is https://vacations.capetown/ your website or the source site from where you want to scrape the content? Please let us know the exact source URL so that we can check.