The phrase "additional proposals" is correct and usable in written English.
You can use it when referring to extra suggestions or plans that complement existing ones.
Example: "The committee reviewed the initial plan and decided to consider additional proposals for improving the project."
Alternatives: "further suggestions" or "supplementary recommendations".
See articleDespite the worsening fiscal environment, the presidential candidates unveiled additional proposals to boost America's economy.
Additional proposals include fashion magazines committing to at least one piece in each issue featuring plus-size models.
The county executive, Thomas R. Suozzi, a Democrat, said he has already made major changes and welcomed additional proposals.
Two additional proposals plan 24 homes north of the Long Island Rail Road tracks and 65 homes near the 111-unit subdivision.
Rushing in the days after the terrorist attacks, Congress pushed through a $40 billion emergency spending package and began considering additional proposals to bolster the economy.
Bankers cite this episode as a warning to the coalition government's banking commission, which could also come up with additional proposals to inject more competition into the system.
At the same meeting, N.S.A. officials made an additional proposal, whose exact nature is not made clear in the censored documents.
that threatens new sanctions if Iran violates any nuclear deal, as well as an additional proposal from Sens. Lindsey Graham (R-S.C).
The transportation secretary, Norman Y . Mineta speaking to reporters at a luncheon at his office, said that he expected additional merger proposals "now that the United-US Airways proposal hasn't gone through".
But additional stimulus proposals collide with rising concerns about deficits.
(Additional development proposals are up for LEED certification in the region in other categories).
