The phrase "according to a custom" is correct and usable in written English.
It can be used when referring to practices or traditions that are commonly accepted or followed within a particular culture or group.
Example: "According to a custom, it is customary to greet guests with a warm welcome and offer them refreshments."
Alternatives: "in line with tradition" or "as per the custom".
The sensor is manufactured according to a custom, 15-step SOI process.
According to a custom mathematical function, the equivalent SINR value for each network is computed and compared.
Cloud computing and the future Internet promise a new ecosystem where everything would be as a service, according to a custom composition and with dynamic management of resources at run-time.
Hence I surmised that, according to a custom of the time by which an English minister sometimes viewed official papers that had accumulated during his term of office as private rather than public archives, Lord Bathurst had transferred the Miranda MSS. to his country seat when he went out of office in 1828.
Before long, according to a custom that has been observed for generations, it is time for the children to marry.
According to Orproject, "The positioning of the façade walls has been developed according to a custom written flow simulation.
The shipment, consisting of 1,148 tusks weighing in at 2,183 kilograms, about 4,800 pounds, was worth an estimated $2.25 million, according to a customs department statement.
The orange lifeboats used to return asylum seekers to Indonesia were stripped earlier this year of safety equipment, including ropes, scissors, knives and other emergency tools, raising further concerns about the use of the vessels, according to a customs officer involved in their deployment.
Later on and according to a medieval custom, four charters were entered on empty pages in minuscule copies of the 12th century.
Anna Tzeng, 44, allegedly obtained pirated software, including samples of the new Windows Millennium Edition, and sent them to customers in Georgia, according to a U.S. Customs affidavit.
Border Patrol agents recovered 26 bundles of marijuana with an estimated street value of $1.79 million, according to a U.S. Customs and Border Protection release.
