Add a file to the config folder of your project and name it XComGrimyLootModWOTC.ini. In it, add the lines:

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[GrimyLootModWOTC.GrimyLoot_Research]
.AR_T1=“[AssaultRifleTemplateName]”
.SG_T1=“[ShotgunTemplateName]”
.SR_T1=“[SniperRifleTemplateName]”
.LMG_T1=“[CannonTemplateName]”
.SMG_T1=“[SubMachineGunTemplateName]” ;LW SMG Mod, for example
.VR_T1=“[VektorRifleTemplateName]”
.BP_T1=“[BullpupTemplateName]”

.Pistol_T1=“[PistolTemplateName]”
.Sidearm_T1=“[TemplarSidearmTemplateName]”
.SGauntlet_T1=“[SkirmisherRipjackTemplateName]”
.TGauntlet_T1=“[TemplarShardGauntletTemplateName]”
.Gremlin_T1="[GremlinTemplateName]"
.PA_T1="[PsiAmpTemplateName]"
.GL_T1="[GrenadeLauncherTemplateName]"

.MA_T1=“[MediumArmorTier1TemplateName]”
.LA_T1=“[LightArmorTier1TemplateName]” ;No templates exist in vanilla
.LA_T2=“[LightArmorTier2TemplateName]”
.LA_T3=“[LightArmorTier3TemplateName]”
.HA_T1=“[HeavyArmorTier1TemplateName]” ;No templates exist in vanilla
.HA_T2=“[HeavyArmorTier2TemplateName]”
.HA_T3=“[HeavyArmorTier3TemplateName]”
.RA_T1=“[ReaperArmorTier1TemplateName]”
.SA_T1=“[SkirmisherArmorTier1TemplateName]”
.TA_T1=“[TemplarArmorTier1TemplateName]”

.SparkRifle_T1=“[SparkRifleTemplateName]”
.SparkBit_T1=“[SparkBitTemplateName]”
.SparkArmor_T1=“[SparkArmorTemplateName]”

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Replace what’s after the equals signs ( the = signs) with the actual names of the templates. If you add more than 1 template to a certain type of item, you need to copy that template line as many times as it takes to add all of your templates. Remove any lines you don’t use. (For example, if your mod adds 50 shotguns and nothing else, your file will have 50 lines starting with .SG_T1= and no other lines)

You only need to do T2 or T3 for light/heavy armors, because those don't have what's called a BaseItem that references other the other light/heavy armors. Other than that, just throw all your tier 1 weapons under T1 and then configure your tier 2 and tier 3 weapons as upgrades of the tier 1 weapons and the game will figure it out.