How to generate graph with fewer edges?

[leeQT]

I downloaded the sample dataset with 1k nodes but I need more fraud activities. I tride to increase the number of alerts but in this way there are too many fraud nodes. So I want to reduce the edge number in the dataset. I changed the degree.csv (reduced all numbers in "count" column under 10) but the total transaction number is still over 100K. Is there any way to reduce edge number?