Hello and thank you for a chance to offer you my services, I can offer you my services as fillable pdf form designer. I can programm your future form to perform calculations, so form will calculate sub-totals and totals automatically.
I would really appreciate if you could share your source file with me along with required changes instructions, so I could give you my best recommendations and share the sample, which fits best to your project tasks.
Looking forward to hear from you soon.
Best regards,
Sergiy.