WordPress. Add custom fields

hi there, we are using the Listify theme by Astoundify. It is a directory theme. Every listing has a owner. But we want one feature more at our site. Every owner should have the posibility to write down every station of his life with month and year. just like a resume, eg ' 07/2014 - 01/2016 working at facebook' . The date and the description should be several fields. And the results should be displayed with a shortcode und should look like a time lime. What we want exactly: every listing owner should have a own time line. this time line should be managed by the listing owner. The time line should be placed at the profile/listing of the listing owner. it could be displayed with code or with a shortcode. It doesnt matter. The project has to be finished today. Please no price negotiations after your bid. do a bid with a realistic price and confirm it.