Hi @spencer182 - if only your most recent position is relevant to the SSCP domains, then you can put the start date of that position. If you've been working on work related to the domains of the SSCP since 2006, you can put that date despite the fact that you have had multiple roles there during that time.
The SSCP only requires one year of relevant work experience - which we waive if you have a degree (bachelor's or master's) in a relevant field.