As HP require Minimum Advertised Pricing to set this up in Prima you would first need to download the file from HP, then you would create this as a mailer using the mailer import template then import into Prima as normal.

To update your MAP mailer 
Publications > Mailers > Double Clicking into the HP MAP mailer > Click onto the Pink Bar (at the top of the page) > then Import (Edit/Replace) > Select file to import.  



If you then want all your customers to just see this pricing you will have to assign the mailers to all companies.  This is done by going to the Company > Companies Grid Manager > Hit search on the pop up screen > Head to the change tab > Tick Publication (Select HP MAP) > Apply.  This may take a few minutes to be applied to all customers.  I have again attached screenshots below to follow.