Upgraded Clearance - what happens to the old one?

I am looking at different employment and had a security clearance question for applications. I had my DoD clearance level raised. I started my current job at a secret level, but had it raised to support new projects. Does this mean that my previous clearance is inactive? For example, if I was at a Secret level, but my clearance is updated to Top Secret, does my Secret clearance become inactive? I have my inspection dates on my resume for both, but this is for the company’s online job posting fillable form.