> For the complete documentation index, see [llms.txt](https://docs.trackwill.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trackwill.com/campaign/custom-cost-model.md).

# Custom cost model

When Custom cost model is checked you can fix your costs on the calendar manually. To do this select the cost model:

![](https://1654950543-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LnCHMNqMqBJ0JbGpOR2%2F-LvIuRFpBjsjI3KuFaa4%2F-LvIvYjw7CI9gT2ejPD7%2Fimage.png?alt=media\&token=e0f65f43-4d33-4070-a060-b120bec316fa)

Then **Save** campaign settings. And in the Campaign page grid check saved campaign and click **Edit Daily costs** button:

![](https://1654950543-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LnCHMNqMqBJ0JbGpOR2%2F-LvIuRFpBjsjI3KuFaa4%2F-LvIwuytV2w1aX69B50K%2Fimage.png?alt=media\&token=2176f48b-9c52-4fda-8a59-b5ba6206a3aa)

At this step, you can fix your costs data for a time period. Also, you can specify the type of payment and the cost of the click at which you buy traffic day-by-day. CPC - cost per click, CPM - cost per 1000 clicks. 

When configuration is done click **Save** button.