Can I create a contact into a lead

Can I create a contact into a lead

Hi, 

I am new to Zoho and have CRM and recruit together. 

I am using the CRM for the purpose of turning contacts from a prospect into a client and then moving over to recruit for the service. 

I have imported all my contacts into CRM and they are all in the contacts field. I have realised that I should have moved some of theses into leads. Is there a way to move some contacts into the leads section on CRM. 

Thank you for your help. 

Steve