Question regarding adding True Strike

[Daggaroth]

Greetings!

I just recently got the d20 system for Hero Lab to build my very first DnD character!

My friend the DM helped me setup a character via the Hero Forge excel spreadsheet and a bit on paper as well and I was moving things over to Hero Lab and I encountered something I haven't been able to figure out.

Among my characters weapons is a bow that has the ability True Strike: Once a day, add +20 to one "to hit" roll. However, I cannot for the life of me seem to figure out how to add this into Hero Lab.

Any assistance in this matter would be greatly appreciated. Thank you in advance for your time and effort in responding to this question.

Bonus side question: In the Hero forge spreadsheet it lists longbows as having damage 2d6+1 and in Hero Lab it shows 1d8+1, which is the more accurate number?