Follow along with the video below to see how to install our site as a web app on your home screen.
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You need to use the Hero Lab Editor. You can get to it by opening it up from the main menu of your Hero Lab Interface (Tools -> Launch Editor). Once there, you could easily create something like a "+1 Longsword" by finding a similar item in the editor ("New(Copy)" button) while under the "Hand Weapon" tab, change/edit the details to match your "+1 longsword", save the settings and then click the "Test Now!" button to test the item/load it into your game system. Once done right, you should be able to see it in your list of equipment you want to assign. For more info, you really should look over the Help guide included with the editor.
The main sheets now print out any special modifiers listed for the weapon. Using the magic weapon tabs in the Fantasy Companion also gives more flexibility.