Official PHB module

[ShadoWWW]

Is there a way how to link pat's statistics to character sheet in Manage Characters?

When I was creating half-orc rogue on level 3 in "Manage Characters", I wanted to add mastiff as a Ranger's Companion to Character sheet, but I coudn't find out how to do it. I also wanted to name him "Brock", and adjust his statistics according to the Ranger's Companion feature. but the default block of statistics was locked.

[Zacchaeus]

You can't add a pet to a character sheet. But you can create a second PC and give it the pets stats etc and just run as two characters. In fact this would be the way you would want to do it anyway since the pet would need to appear in the Combat Tracker.