When you're importing your clients, you have face a situation whereby the same email address is being used by the LTD and a contact / director. The system will not allow duplicate emails for the import to work successfully, so here's the best way around it

1 - Delete the email address from the LTD section. It's a system requirement for the INDIVIDUAL / SOLE TRADERS have an email address, not the LTD

2 - The system should link the contact to the LTD as it's searching for matching details like Forename and Surname. 

3 - If they don't link automatically, link them via the LTD section 2 - 'Related individuals and contacts'

Here's an example of how the Import should look and work

LTD

Sole Trader with the same name

During the import, it's important to acknowledge and fix any error messages - eventually, it should return a GREEN message stating the data is VALID

Once Imported, because they shared exactly the same forename and surname, the system has automatically linked the 2 entities together, without manual manipulation. This is how the system should work. 

NEW LTD WITH CONTACT ASSIGNED

LTD WITHOUT CONTACTS

If for whatever reasons yours do NOT link automatically, simply locate the LTD and in section 2 'Related individuals and contacts', ADD