Patterson, in the role since 2013, said the restructuring, would focus on the essential services needed by consumers and businesses.
BT is planning to cut jobs by 13,000 over the next three years - more than had been rumoured only last week - as it looks to cut annual running costs by £1.5 billion.
BT said in a statement alongside its annual results that it will shed the jobs over the next three years as it seeks to slice off an extra £1.5 billion ($2.0 billion, 1.7 billion euros) in costs.
Two-thirds of the jobs cull will fall in the United Kingdom (about 9,000 jobs), with the remainder coming from the 18,000 staff employed by the telecoms giant overseas.
"Our integration and restructuring activities remain on track".
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The company is also planning to move out of its London headquarters in St Paul's, where the company has been based since 1874.
"Many of the roles that BT is proposing to cut are highly skilled professionals and the loss of that expertise could impact BT's research and innovation capability", she said.
The company added that it would be hiring around 6,000 new employees "to support network deployment and customer service".
"If we compare how we manage the business with our peers, we're frankly too complex and overweight".
"Our strategy will drive sustainable growth in value by focusing on delivering differentiated customer experiences, investing in integrated network leadership, and transforming our operating model", said BT chief executive Gavin Patterson.
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In a strategy update to the stock exchange, the telecommunications giant said the move was needed to maintain its "leading position in converged connectivity and services in the United Kingdom and for multi-national corporations".
"While I recognise the pain, ultimately it is the right thing to do for the business".
The FTSE 100-listed firm is maintaining its dividend - despite worries over a possible cut - and has agreed a new pension funding plan to provide confidence about the long-term outlook. It is to pay ￡2.1 billion into the scheme by 2020 and a further ￡2 billion would be funded by the issuance of bonds.
That goodwill came to an end when the group delivered a major profit warning in January 2017 due to problems at its multi-national Global Services division and the discovery of fraud in its Italian unit.
A BT spokesperson, said: "There are no details at this stage of either the reduction in roles, or the new jobs we have announced today, or what this means for individual locations around the country".
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