You can edit the warranty field of an asset in two ways:
Editing it on a single asset page (pressing Edit asset, top left underneath Asset Options)
Going to the page with all assets, check the assets you want to give the same warranty date, then click Mass Edit Assets in the menu to the left and in the popup select Warranty Date
You can edit the warranty field of an asset in two ways:
Editing it on a single asset page (pressing Edit asset, top left underneath Asset Options)
Going to the page with all assets, check the assets you want to give the same warranty date, then click Mass Edit Assets in the menu to the left and in the popup select Warranty Date