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subnets themselves don't have an ID in ARM, you need to get the vnet ID and append

/subnets/<subnetName>

@miniature-leather-70472 sorry, but how can I do this? My idea is to to do similar to

const subA = new network.Subnet("subnetA", {
  addressPrefix: "10.0.0.0/24",
  resourceGroupName: resourceGroup.name,
  subnetName: "subnet-a",
  virtualNetworkName: virtualNetwork.name,
}); 

subA.id

This objects has id method as I can see.

Ignore me, you are correct that it does have an ID object. What yo've written should work

@miniature-leather-70472 is it possible to get subnet id in case I created them inside

network.VirtualNetwork

?

You could create the subnet and use the ID later;

const virtualNetwork = new network.VirtualNetwork("networkname", {
    resourceGroupName: resgrpName,
    addressSpace: {
        addressPrefixes: [testConfig.require("NetworkSegment")],
    },
});

const Subnet = new network.Subnet("subnetname", {
    resourceGroupName: resgrpName,
    virtualNetworkName: virtualNetwork.name,
    addressPrefix: testConfig.require("NetworkSegment"),
    networkSecurityGroup: {
        id: NSG.id
    },
});

const networkInterface1 = new network.NetworkInterface("test-nic", {
    resourceGroupName: resgrpName,
    ipConfigurations: [{
        name: "test1ipcfg",
        subnet: { id: Subnet.id },
        privateIPAllocationMethod: network.IPAllocationMethod.Dynamic,
        publicIPAddress: { id: publicIp1.id },
    }],
});