On the Lead Form we are using Parent Account look up . There is also a Customer look up on Lead Form . Need to know the significance of using customer look up.

On the Lead Form we are using Parent Account look up  to map the existing account . But the Activities are not rolled up using this relationship. There is also a customer look up on Lead Form . Need to know the significance of using customer look up. For Example if we use customer lookup on Lead , Activities can be rolled up from Leads to Account . Any other benefits of using customer look up?