Prestashop 1.6 - Multishop, multidomain and multisite

[fgarganese]

Hi to all,

using Prestashop 1.6 I must realize a multishop having this scenario:

1. the main site is www.FIRSTDOMAIN.xx
2. the second site is shop.SECONDDOMAIN.xx, where already exists www.SECONDDOMAIN.xx
3. the production server has no panels, so DNS and APACHE must be set manually.

The main problem is that I cannot config SECONDDOMAIN as parked domain, because there is another active web site.

I already did a decent Prestashop config regarding multishop catalog and themes.

Anyone could help me? 

TIA

--

Francesco