This is an example code of a model.
Code:
// 21 hit box(es)
$hbox 3 "Bip01 Pelvis" -4.690000 -4.440000 -6.750000 4.000000 5.560000 6.750000
$hbox 6 "Bip01 L Thigh" 2.660000 -3.690000 -3.090000 18.160000 4.880000 3.310000
$hbox 6 "Bip01 L Calf" 0.380000 -3.970000 -2.840000 17.600000 4.000000 2.940000
$hbox 6 "Bip01 L Foot" 0.850000 -3.240000 -2.640000 5.730000 8.530000 3.170000
$hbox 7 "Bip01 R Thigh" 2.470000 -3.690000 -3.160000 18.129999 4.880000 3.380000
$hbox 7 "Bip01 R Calf" 0.310000 -3.970000 -2.840000 17.600000 3.940000 2.970000
$hbox 7 "Bip01 R Foot" 0.850000 -3.240000 -2.640000 5.730000 8.530000 3.170000
$hbox 3 "Bip01 Spine1" -3.250000 -5.500000 -5.500000 4.830000 5.500000 5.500000
$hbox 2 "Bip01 Spine2" -0.060000 -5.530000 -7.590000 8.000000 7.000000 7.590000
$hbox 2 "Bip01 Spine3" -2.250000 -6.810000 -6.310000 6.500000 5.090000 6.310000
$hbox 2 "Bip01 Neck" -3.110000 -1.500000 -3.000000 2.050000 3.500000 3.000000
$hbox 1 "Bip01 Head" -0.330000 -4.500000 -2.500000 8.000000 4.500000 2.500000
$hbox 4 "Bip01 L Clavicle" 0.940000 -2.880000 -4.130000 5.440000 4.280000 3.500000
$hbox 4 "Bip01 L UpperArm" -2.160000 -2.340000 -2.560000 11.560000 3.410000 2.380000
$hbox 4 "Bip01 L Forearm" 0.590000 -1.810000 -2.190000 10.750000 2.840000 2.410000
$hbox 4 "Bip01 L Hand" -0.132201 -1.903020 -2.238530 4.862900 2.078240 2.369790
$hbox 5 "Bip01 R Clavicle" 1.380000 -2.840000 -3.560000 5.690000 4.310000 4.310000
$hbox 5 "Bip01 R UpperArm" -1.880000 -2.470000 -2.160000 11.810000 3.280000 2.810000
$hbox 5 "Bip01 R Forearm" 0.440000 -1.970000 -2.340000 10.590000 2.720000 2.220000
$hbox 5 "Bip01 R Hand" -0.132201 -1.903020 -2.238530 4.862900 2.078240 2.369790
$hbox 8 "Bip01 L Hand" -16.100000 -6.500000 -19.000000 10.600000 1.500000 33.000000
Make sure that after "$hbox" you have a number, 1 through 8, these numbers represent the hitzone damage multipliers
1 - head
2 - chest
3 - stomach
4 - left arm, etc
You can take a look here: https://developer.valvesoftware.com/wiki/$hbox
Make sure these are correct in your model, if they are all 0, well, problem lies therein. You'd have to edit qc and recompile.
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