Check if this option is available on your Bitrix24 plan. You can find the information about all plans on the pricing page.
When working with deals, you can change the pipeline for several deals at the same time using the group actions option.
Open the List view and select the pipeline from which you want to transfer deals.
Then check the deals and open the action menu at the bottom of the page. Select the Move to pipeline option.
Specify the desired pipeline and click Apply.
Note: when you move deals from one pipeline to another, the stages of deals will be reset, as well as all the history of their changes in the old pipeline.
After that, the selected deals will be moved to the new pipeline.
Read more information in the article: Multiple pipelines.