Yes, an NGO registered under the West Bengal Societies Act 1961 can donate immovable property to another NGO or trust, provided its Memorandum of Association (MOA) and bye-laws permit such a transfer. The process requires a registered instrument signed by the donor and attested by two witnesses, with registration within four months. While sales attract standard stamp duty, gifts to other NGOs typically incur nominal stamp duty, though this can vary based on state rates and whether the recipient is considered a 'family member' for duty purposes. Consulting a local lawyer is recommended for specific advice.