How to turn a pdf file into excel document and keep original format

Question

I Have an excel bid form that i use all the time ,then i convert it into a PDF  And once in a while i need to add something to it  I paid for acrobat but when i try to turn the PDF back into an excel document the format is changed , the columns are in the wrong places And it does not look at all like the original excell form is there any thing i can do to  fix this If not this will be useless to me  any help appreciated

Answer 1

A PDF does not contain any spreadsheet, word processing or page layout file format information.
No "format", columns, rows, etc.
"When you create a PDF, you’re painting a picture. Your paintbrush is the is the result of a combination of the software used to create the source document and the software you’ve chosen to convert your source document into the universal electronic document format we all know as PDF.
Like the painter’s brushstrokes, each character, each line and each image is fundamentally independent, but they can interact with each other to produce particular visual effects. On the PDF page, objects are connected by a coordinate system and not a lot else. There’s no logical, semantic connection between the letters comprising a word; characters simply happen at a series of locations on the rendered page.
As originally designed, PDF is fundamentally a system for painting objects onto a page, plus a whole lot of other features we aren’t talking about right now! There’s no innate concept of words, sentences, paragraphs, columns, headings, images, tables, lists, footnotes – any of the semantic structures that distinguish a “document” from a meaningless heap of letters, shapes and colors. PDF is fundamentally about how the document appears on the page, not how it looks when abstracted from the page."
Duff Johnson, Each PDF Page Is a Painting
http://talkingpdf.org/each-pdf-page-is-a-painting/ 
Be well...