Where do I add medical expenses paid with my HSA/HCSA provided by my work benefits?

My husband has a regular health care benefits plan with his job that covers us and our kids.  I, on the other hand, have a HCSA or HSA provided by my job's benefits plan. So, for any medical expense or remaining amount of medical expenses not covered by my husband's plan, I claim against my HCSA/HSA account. Where do I report the amounts claimed against my HCSA/HSA account? 

For example, If I paid 100$ for a medical expense and my husband's plan reimbursed 80$, I know that I have to put 100$ in the "Amount" field and 80$ in the "Less:reimbursement" field but where does the remaining 20$ goes?