What's your question? Ask

Wrong fertilizer. If you haven't given it food or the wrong kind, it will not bloom. Rose bushes need lots of food to grow their beautiful flowers

Knock Out roses are less prone to disease and flower all summer if given adequate care. Normally the soil is amended with peat and/or compost to have soil that retains moisture. Roses like lots of bright sunshine, water and long-acting fertilizer. For best bloom, it needs at least 6 hours each day of direct sunlight and 1-2 inches of water weekly. Don't just water the base of the shrub; many of the tiny feeder/water roots are on the edge of the bush and past that. Put down 3 inches of mulch to keep roots cool and moist. Do not let the mulch touch the plant base. If you are growing in containers, here is a helpful article: https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-planted-containers.htm

Here is an article for you on this topic: https://www.gardeningknowhow.com/ornamental/flowers/roses/roses-from-cuttings.htm
Keep in mind that some roses are grafted onto hardier root stock as they are just too weak on their own roots to survive in various climatic conditions, so the newly rooted rosebushes may not survive.

These are very similar roses developed by different breeders. Iceberg is hardy in zones 4-9 while icecap is listed for zones 5-9. Iceberg is approx 4 ft tall, taller than icecap which is listed as 2 1/2 ft tall. Both have 25 petals per bloom and both are considered floribunda shrub roses. I hope this helps.

The brown spots and some tiny holes plus no buds sounds like insect issues to me. I suggest using a systemic insecticide product that will get to the insects and help rid the rosebushes of the pests and the stress they are dealing with from the pests.