Usually there are different ways of changing the price in Shopify with GJ Bulk Price Editor. In brief, you can find a summary in the header, but if you need more information, you're welcome to explore further.
Before we begin, we'll touch upon the various price types, which include two: the regular price and the compare-at-price. Regular price is just a price that your customer pays for the product and compare-at-price is the price your customer sees crossed — if they are both used it helps the customer to see, that the product is at sale and they'd better buy it now while it's cheap. Also please note that compare-at-price is shown in the product page only if it's higher than regular price, otherwise it's just doesn't make sense. In the context of these types of prices optional cost-per-item might be mentioned — it is the price that you as a merchant pay for the product itself and you can include any costs here, generally for convenience to do more simple math of your profits. Your prospects don't see it. Here at the screen is how these types of prices are set:
Here is what your customer sees:
Let's now see the actual ways to change the prices.
Straightforward change the price for the specific one.
Adjust by amount
Increase or decrease the price by some amount. Say, you have a product priced $100, then this action will make it $110. If you change multiple products (as you normally do) and you have a product priced $200 alognside with $100, then the new ones will be $110 and $210. Just simple as that.
Adjust by %
Increase or decrease the price in Shopify by percent. Let's say, you have a product priced $200, then this action will make it $220 ($200 + 10% ($20) = $220). It's is also quite straightforward.
Adjust by amount against Compare price
It is a more interesting one, here you take a compare price as a basis and add/subtract amount to/from it and use the result as new price. Say, you have compare-at-price $200 and some regular price. Then adjusting (decrease) the price by 10 against compare-at-price (as shown on the screenshot) will make the price $190. The original price value doesn't matter here.
Usually we use decrease adjustment here as it makes sense for the price to be lower than compare-at-price.
Adjust by % against Compare price
It is just as the one above. You take a compare price as a basis and add/subtract percent value to/from it and use the result as new price. For example, you have compare-at-price $200. Then adjusting (decrease) the price by 10% against compare-at-price (as shown on the screenshot) will make the price $180 as 10% difference is $20 here. The original price value doesn't matter here.
Again, it makes sense to use decrease adjustment here as price usually is lower than compare-at-price.
Set to Compare-at-price
Typically it is the case when you want to revert a sale. Let's say you have a sale and sell something with original price of $120 with a discount of $21 for $99 - as shown here:
Then when you want to make it back and sell the product for the original price of $120, you do set to compare at price for you price.
Set based on cost per item
This is nice one. As we discussed before, you may set cost per item for a product — say the cost you pay to get the original product at your warehouse. Then to keep your math simple, you come up with a margin for your product and you set it here. Say you pay $500 per a product for your supplier. You know that typical margin for this kind of product is 10%. Now you use set based on cost per item and all your products in this task will have price 10% higher than its cost-per-item. The $500 product in the example will have price $550.
Note about Compare-at-price
All mentioned above is the same for compare-at-price. It has small name differences like set to price that is used to set compare-at-price to the price, but the idea remains the same.
The one thing to mention is that for compare-at-price you can check Apply changes only if Compare-At-Price is set initially and it will apply the changes to compare-at-price only if it is set, i.e. it is not $0.
Say, you have Product 1 with price $10 and $20 compare-at-price and Product 2 with price $10 and $0 compare-at-price (no compare-at-price really). Using this toggle while increasing the compare-at-price by $10 (as shown on the screen) will change the compare-at-price only for the Product 1 making it $30.
That's it! If you still don't have it, you can install GJ Bulk Price Editor for Shopify here