Add Job Tile, format text bold,.. in External Supplier Registration Page

Dear team,

I have some requirements on customize the External Supplier Registration Page as summary below

1. Format a few words in a text sentence bold
2. Add the "Job Title" field in "Your Contact Information" and have it populated in the next page
3. Add one more address form
4. Products & Services: make it mandatory to select the product categories to level 3 (of the category hierarchy)

Kindly refer to the attached file which I captured the relevant screenshots for more details.

Thank you.