I need to add new properties in DAM assets for TOUCH UI. I have done it for Classic UI. But not getting or TOUCH UI where to customise new properties.
Adding to what mark has suggested you:
There's a GUI for modifying the Asset Metadata forms. To get there, select Tools > Assets > Metadata Schemas from the left rail.
Documentation can be found at http://docs.adobe.com/docs/en/aem/6-1/administer/content/assets/metadata-schemas.html
Reference article :- http://stackoverflow.com/questions/31383230/how-to-show-edit-custom-properties-on-the-properties-pag...
What sort of properties?
You can add metadata fields to the display: