Need to add some fields on a existing PHP Script

hey guys i am new here, and thanks for this awesome forum
i have a question regarding PHP coding, i bought a invoicing PHP script which is really cool and working nicely, but the problem is a field thing is missing on the invoice creation tab/panel, for example when i add a invoice everything is cool, like Invoice Number, Data of Issue, Due Date, Amount etc here i want to add a extra field for (BL Number) for my own record, somehow i proceeded and is working except it doesn't show the BL…
Need to add some fields on a existing PHP Script

See original post by 3dwarrior