NEW Item method

Hi,

I understand that New Item method kicks off Create member workflow step. What are the limitations for the create member workflow step..?

I have a requirement where when user right clicks on new item method the user should be able see options for New Item code, dropdown to select available product family, dropdown to select from available product category, dropdown to select from available Item type, dropdown to select from available Org, dropdown to select from available Sales Channel. I tried creating this type of setup but creating product category, product family, item type, org, sales channel as an attribute for Item and making them editable and mandatory in new item method.