The phrase "a group of existing" is correct and usable in written English.
It can be used when referring to a collection of items, individuals, or entities that are currently present or available.
Example: "The committee will review a group of existing proposals before making a decision."
Alternatives: "a collection of current" or "a set of available".
In May, Sequoia joined a group of existing investors to pour $100 million into Coupang in its first South Korea-based investment.
An approach by taking the correlation among structural collapses into account in selecting the optimum upgrading level of a group of existing structures is presented and illustrated by a numerical example.
AllTheCode have today launched a new code search engine which has joined a group of existing solutions including site such as Krugle, Koders and Google Code Search, no less.
Libersy, an Amsterdam-based startup that helps small businesses handle bookings and payments online, has raised a new round of investment from HenQ Invest and a group of existing investors.
It is that a group of existing technologies have matured to the point that now they can be combined into something practical and useful.
After the server validates and retrieves the input, the DNA sequences are processed by a group of existing ab initio motif discovery programs.
It's a grouping of existing blogs – the Engadget sites, Switched, TUAW and Download Squad, under a new tech content group.
Since the seismic behavior of buildings cannot be specified one by one, in order to reduce the number of structural models, it is required that the representative buildings is selected with the aim of being a good sample for a large group of existing buildings by statistical study on desired area.
First, this is an estimate of a local average treatment effect for a particular group of existing claimants.
For example, in January 2013 the government launched an experiment that allows a large group of existing beneficiaries to return to work without fear of ever losing their right to return to benefits.
The new profile page updates are currently available for a select group of existing users, including a small list of celebrities, while new users will start with the new profile design when they sign up for a Twitter account.
