How to jumpstart the new parent company site?

[Socialrocketco]

A client operates four well known brands inside the industry, and each website has a relatively (for the industry) high amount of Domain authority across these four sites.

They just formed a group of these four brands and launched a new website with no authority. What steps would you take to instantly grow the authority of the new site?

[AutonectGlobal]

Assuming the parent company site has children site - link to the new parent site from all of your child sites.

Issue press releases:

• PRFire.co.uk
• PRLog.org
• Free-Press-Releases.com
• 1888PressRelease.com
• 24-7PressReleases.com
• PressBox.co.uk

The list of free PR sites goes on.

There are also a lot of high page rank sites, like PRWeb and eConsultancy.