Bournemouth Borough Council is set to create a £500 million framework agreement that features IT.
The ten year framework, which will run from April next year, also includes facilities management, and benefit and revenue processing.
The IT elements of the framework include off the shelf software, bespoke development, consulting, network technology, printers, and internet support services.
The procurement agreement is for Bournemouth itself and other councils including Dorset, Christchurch and Purbeck, as well as Bournemouth and Poole College, and Dorset Fire and Rescue Service. All other councils within the south west may also use the framework.
Bournemouth itself expects to spend £160 million within the framework over 10 years, but may expand spending to £240 million.
In a contract notice, it wrote that with the other authorities procuring through the framework “the total could amount to in excess of £500 million”.
"The ultimate scope will ... be shaped during the procurement process so as to deliver the best possible outcome in terms of efficiency, employee protection and improved performance,” it added.
On 30 July interested companies may meet with representatives of Bournemouth.
Councils in the south west have made use of shared agreements in the past. The highway authorities of Dorset, Bournemouth and Poole in February said they had begun sharing a roadworks management system from supplier Exor.