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This is subnet bring up I have used but also tried creating subnets without the loop

subCount := 0
		for sub, cidr := range subs {
			_, err = ec2.NewSubnet(ctx, sub, &ec2.SubnetArgs{
				VpcId:                                vpc.ID(),
				CidrBlock:                            pulumi.String(cidr),
				AvailabilityZone:                     pulumi.String(azs[subCount]),
				EnableResourceNameDnsARecordOnLaunch: pulumi.BoolPtr(true),
				MapPublicIpOnLaunch:                  pulumi.BoolPtr(true),
				Tags: pulumi.StringMap{
					"Name": pulumi.String(sub),
				},
			},
				pulumi.DependsOn([]pulumi.Resource{vpc}),
			)
			subCount++
			if err != nil {
				return err
			}
		}

Making changes is supported, what error do you get?

It says failed to create the subnets - what is happening is, it doesn’t look to modify the subnet but rather re-create it and with the CIDR taken for subnet, it fails

set this on the provider: https://www.pulumi.com/docs/intro/concepts/resources/options/deletebeforereplace/

that helps, will try adding this.