Custom Plugin - Add Pricing to Samples

Background info: 1)Currently, the back office has a custom plugin on the left menu called "samples". 2)The Samples plugin looks very similar to the Pages or Posts function 3)When I have a new sample to add to the website I click on samples (there is a list of current samples) then I click on add samples, it brings up a screen almost exactly like the "add a new Page" screen 4)I upload a 580x580 .png via the "Featured Image" option 5)Above the Featured Image box there is a box called "Sample Categories" where I can choose one or more categories for the sample 6)Once I click publish, the app places the sample on one of the following pages based on which category I chose: [login to view URL] [login to view URL] [login to view URL] [login to view URL] 7)Not only does the app place the image on these pages, all uniformly formatted, but it also creates a new page for the image 8)So, if you click on one of these sample images, you will see it's dedicated page The project: Set up a plugin using the attached pricing spreadsheet that will: 1) automatically insert a price into the displayed description ( for example, on the page [login to view URL], it now says "64 - One Sided (Click image to view)", with the new plugin it would say "64 - One Sided (as low as $0.60 ea.) a) it should pull the price from the quantity of 500 per each column in the price matrix based on the product selected when the sample is uploaded. in this example it would be cell D96 on the spreadsheet because it is a one sided invitation. b) the prices will change frequently, so the plugin needs to allow me to update prices c) the quantities will also change and we will add additional quantities, so i will need to be able to expand that as well d) we will also be adding more products, so the plugin will need to do that as well. 2) automatically insert a price into the designated page (template) for that sample for example on the page [login to view URL] it would say "as low as $0.60 each" in red zapfino font directly below the invitation see the attached screenshot for an example. 1) this should also pull from the pricing plugin from the quantity of 500 for the one sided invitations 2) pricing will change frequently, so the plugin must include an interface that easily allows me to add products and quantities as well as change pricing.