Or else You can go with this Process.

How to create new records from a lookup search?

Frustrated of not finding the person you're looking to add through a lookup search and having to exit out of the search to create that record?  Well now you can create a link in the lookup search that will allow you to create that record from the search itself.

To best explain this, lets pretend that you want to be able to create a new Account through any lookup field. A likely reason would be that you're entering a contact or an opportunity and you're trying to link the contact or opportunity to an Account, however their account doesn't exist so you want to create one.

First, you will want to create a custom formula text field on the Accounts object (or the object that you wish to create a new record for, whatever it may be). 
Go to: | Setup | Customize | (Whatever Object) | Fields | New | Formula | Text |

Your formula should look something like this:

HYPERLINK("https://na5.salesforce.com/001/e?retURL=%2F001%2Fo", "Create a New Account")

Note: The URL that you want to use is the same URL of the page when creating a new account.  This URL will vary per org and per object.  To get the appropriate URL, go to the tab of the new record you wish to create and click to create a new record for that object.  When you're prompted with the typical new screen for a record (with essentially no information and all editable fields) this is the URL you want to use.  

The text in the quotes is how your Hyperlink will appear.

Save the field and DO NOT ADD IT TO THE PAGE LAYOUT.  It is not necessary for this field to be added to the page layout.

Next, you want to add this to the Search Layout for Lookup Dialogs.  
Go to: | Setup | Accounts | Search Layouts | Lookup Dialogs | and find the Custom Formula field that you just created and add it.

You will now be able to create a new Account from any Account Lookup field by selecting the exposed link(your custom formula text hyperlink) from the lookup search.

Thanks,

Milan Sanghani