Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
There is nothing wrong with making specific amounts of money as waqf, or endowment, with the intention of making profits in a halal business in order to help care for orphans or for other charitable causes.
In his response to your question, Prof. Dr. Monzer Kahf, Professor of Islamic Finance and Economics at Qatar Faculty of Islamic Studies, states:
This form of waqf or religious endowment is practiced all over the Muslim world. It may be better to put the waqf with institutions such as Islamic banks or shareholding companies. You should define the objective and the checks and balances on the managers of this waqf very clearly and in detail.
Almighty Allah knows best.