Add button and external link in product page

-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.2
-- PHP version -- : 7

HI,

I am using HIkahop Enterprise version. I have used custom fields to display certain features of the product. I also want to add various buttons in the product page like download button and a button that will contain links to external domain.
In the custom fields, there is no such thing as button type. So, I used the link option there but when I add a link of an external site it goes something like this: www.mysite.com/productpage/externalwebsite.com

While I simply want the link to be externalwebsite.com.

Now 2 questions:
1) Is it possible to somehow create dynamic buttons in product page so that I may redirect to external links and some to my website page?
2) If i use the link option, then how can I solve the problem of external link?

Perfect. I was facing this issue of entering the external link. The http:// solved my problem and for buttons I hid them in frontend page because they were showing under specifications rows. I wanted them to show somewhere other so i overrided show_default.php for this and applied my custom code for it. Entered the values in backend and showed in relevant code of mine.
I hope this is the correct way of doing it