Export Cells from one workbook to another workbook multiple times

Hi i am starting a project at work which basically takes a description of a part & a value of it then pastes it into another workbook withing the same folder as described further below:

I have a folder with 2 workbooks in. One workbook with one sheet both named “Estimate New”. The other workbook with one sheet both named “Price Build up”. Estimate new has a description box which is manually entered to describe the manufactured part which is cell C9. Also on this sheet is a cell with a calculated cost which is F15. When a macro is run I want the workbook “Price Build up” to open if not already open then I want C9 & F15 of “Estimate New” to be copied then pasted in cells E10 & F10 respectively of the sheet “Price Build up”. Once this is done & new values entered into cells C9 & F15 of “Estimate New” I require the new values to be copied & pasted in the next row below in the sheet “Price Build up” i.e cells E11 & F11. I want this to continue for several lines each time the cells C9 & F15 are cleared & new values entered. I think i will link the macro which i want in the sheet “Estimate New” to a command button called “Export”.

Hope the above makes sense?

Hope someone can help??
Pleeease!!!:)