Can I make calls in WhatsApp via Contacts+ app?
If your contact is linked to their WhatsApp account, you can quickly initiate a WhatsApp call by opening the contact >> tap on the Whatsapp icon displayed next to the number where you will have an outgoing WhatsApp call.
Is there a way in Contacts+ app where I can directly go to Whatsapp conversation from a C+ contact?
Yes. Simply open the contact >> WhatsApp icon will be displayed next to the number (only if that number is linked to their WhatsApp account) >> tap on the message icon and you will be redirected to your WhatsApp conversation with that specific contact.
Note: This feature is applicable only for device contacts.