Hi dan_tcob24,
If you have set up a new limited company then this is a separate legal entity to your existing business and so if the turnover of the new business breached the £90K threshold then there will be a requirement to register it for VAT separately.
If certain criteria are met then you can form a VAT Group whereby one Group VAT number will cover both businesses.
Please see the guidance below:
2. Group registration
Thank you.