If you want to add a Rake, go to Catalog -> Manage Products. Then click on the "Add new" button in the top right corner. You will see window as follows:
In the case of rake, we need to set the fields 'Product type' as 'Bundled Product' and 'Product Layout' as 'Rake Product' as shown below.
Add Products in Bundle
Click on 'Bundle Product' and then 'Add new products' to add products to bundle.
Product attributes
Please refer Product attributes.
Update In Tractor Plugin
Once a new tractor is added, we have to update the sku in tractor plugin also.
Navigate to Admin- Plugins- Tractor Management- Configure- Rake group SKU configuration
Add the SKU in proper rake group.