If it's for personal use you should be ok, but if you are importing for commercial purposes you need an appropriate license or have to go through a company. Check with the shipping company. Usually there is 5% duty.
Please contact Three line shipping company for clarification.
Three Lines Shipping & Logistics WLL
+974 4466 5660
Jabir Bin Hayyan Street، Old Airport Area، P.O.Box 201753، Doha, Qatar
Not sure of the limits, long as you can pay the Customs Duty charges.
All goods imported into Qatar are subject to customs duties, based on a percentage value of goods (typically 5%), or a per unit basis. The value of goods is calculated according to the Regulations under the Customs and Ports Law.