how to connect multiple branches in bitbucket pipeline file on aws

[Ayush Sharma]

image: node:10.15.0

pipelines:

  default:

    - step:

        script:

         - apt-get update && apt-get install -y python3-pip

         - pip3 install -U awscli

         - aws --version

         - cd deployment

         - sed -i -e 's/\r$//' deploy.sh

         -  /bin/bash deploy.sh

I use this file but use both branches