One of their plans is for partners and staff to give up a day in the office to spend at the Foundation helping out with tasks such as painting and gardening.
The charity is also to sell raffle tickets at the annual Simmons Gainsford rounders business networking event to be held at Maresfield on Thursday, July 7.
Caroline Otterheim, head of marketing at Simmons Gainsford Group said there were also other plans in the pipeline to support the cause.
Jenny Hanraads, development manager at Chailey Heritage said: “We are so grateful to Simmons Gainsford for their support which will help us to provide specialist equipment and facilities that level the playing field for children and young people with very complex physical disabilities and health needs.
“All of the young people we support are wheelchair users and rely on highly specialised equipment to participate in activities such as cycling or swimming that their able-bodied peers may take for granted.
Jenny added: “Support from the community is vital in providing the facilities which enable them to fulfil their potential and lead as active, happy and fulfilled lives as possible.”
James Duggan, partner at Simmons Gainsford in Uckfield said: “We wanted to give something back to the local community and chose this charity because we are so impressed with the difference they make to the lives of the young people they support.
“We hope that working alongside the Foundation staff will allow our team to connect with both the Foundation and the young people themselves.”