This is something that has bugged me for years on Shapeways. Suppose I upload a model and set it up for 40 different materials. (I did this today) Each material has a base price with $0.00 added on. If I want to give myself a 30% mark up on each material I have to open a calculator, type in the base price, hit + 30% =, then type that number into Shapeways and repeat that 39 more times. Isn't there an easier way to do this? If I'm uploading several models this could take hours. I thought I heard that there was an excel spreadsheet you could download with all of your prices so you can change them all at once, then upload that back up but I can't find any download anywhere. Even better would be if I could just add 300% to everything on the site.
Go to your shop settings page https://www.shapeways.com/shop/settings/ and then you'll see some additional tabs, 2 of which show CSV options - Pricing CSV Wizard and Category CSV Wizard. That's where you'll find the download buttons. I haven't personally tried this because I am waiting for a simpler percentage or straight mark-up value mechanism, and because I've read about there being various problems at times using it I am convinced that I would completely destroy my shop. Other people seem to have no problems. Good luck!
Let me refer you to an old thread. https://www.shapeways.com/forum/t/mass-markup-tool-question.6470 One thing of particular note: you do NOT have to upload "all" prices in your shop every time, in a single step. You can separate the file into segments (even as little as one single model/material at a time) - any records that you do NOT upload are left unchanged.
Yeah I've tried it a couple times now. I see that only the changes I make are shown. It's actually pretty easy. Especially after I learned elsewhere how to increase a list of numbers by a percent. In Excel / Calc.