The phrase "a new portion of" is correct and usable in written English.
It can be used when referring to a specific segment or part of something that is being introduced or changed.
Example: "The chef decided to serve a new portion of the dish to highlight the seasonal ingredients."
Alternatives: "a fresh segment of" or "an additional part of".
The operating joke whenever I was given a new portion of the manuscript was: Top Secret: Burn Before Reading.
A.T. & T., which paid $6.6 billion last year for a new portion of the wireless spectrum unbound by net-neutrality requirements, has protested this proposal, calling it a "bait and switch".
Livingness of hex-1-ene polymerization was demonstrated for the first time for nickel complex bearing ethyl ortho aryl substituents by reinitiation of chain growth upon addition of a new portion of monomer.
In percussive drilling, blows are applied successively to a tool attached to rods or a cable, and the tool is rotated so that a new portion of the face is attacked at each blow.
In a new portion of Mr. Rangel's district in the Bronx, where the population is heavily Latino, several people interviewed said they were surprised to hear he was of Puerto Rican descent.
Without those pledges, the International Monetary Fund was wary of releasing a new portion of aid promised in its first loan a year ago, and European leaders were loath to come up with new financing.
Newer growth is more active, so it is recommended that you choose a newer portion of vine rather than and older portion.
In the environment, do they quickly degrade into their metallic components – and hence we would not require a change of paradigm, just a good identification of the new portion of the periodic table which is being exploited and dispersed.
Instead, the FCC recommends a fresh approach: freeing up new portions of the wireless spectrum and encouraging mobile broadband providers to fill the gaps in coverage.
In the end we obtain a steady-state picture in which new portions of molecules are injected in water, form bubbles, and leave as a result of bubbles flowing up.
Beneath a New Mexico sized portion of the Red Planet's cracked surface, lays a large volume of water ice, The New York Times reports.
