The phrase "a section of which" is correct and usable in written English.
It can be used to refer to a specific part of a larger whole, often in formal or academic writing.
Example: "The report includes several chapters, a section of which discusses the implications of climate change."
Alternatives: "a part of which" or "a segment of which".
The Secret Service has ordered some 40 miles of roads closed around the Fleet Center, where the Democrats will meet, including Interstate 93, a section of which runs above ground just 40 feet from the arena.
(The Met's seven-piece "Hunt of the Unicorn" set -- a section of which is in the show -- was discovered on a French farm in the 19th century being used to protect vegetable beds from frost).
The soundtrack is integral: Mr. Preljocaj's cleverly named "Empty moves" (a section of which was first presented at the Joyce Theater in 2006) mirrors "Empty Words" in its unflappable commitment to form.
The route of an ancient Roman highway is partly followed by Watling Street, a section of which (in modern Kilburn High Road and Shoot-up Hill) skirts Camden's western edge.
Since the mid-1960s oney one P.B.D. has been declassified: the Aug. 6, 2001 P.D.B. for former President George W. Bush, a section of which was declassified as part of the 9/11 commission report.
Near Bahir Dar, the lake is dammed by a lava barrier over which the Blue Nile pours, dropping 138 feet (42 metres) to form the spectacular Tisisat Falls (a section of which has been harnessed for hydroelectric power).
Much of the novel is a pursuit, a memorable section of which involves our hero being chased through the London underground and killing one pursuer at Aldwych station.
A section of Ocean Boulevard, which runs through the redevelopment area, will also be redesigned.
But the author self-published a section of it, which then won Britain's Caine prize for African writing last year.
The train, travelling at more than 100mph, derailed after passing over a section of rail which then fractured.
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