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%%[
Var @ontrade, @email, @otdec, @emdec, @update1, @update2

Set @ontrade = Lookup('GB_Test_Kit_Count', 'count', 'type', 'ontrade')
Set @email = Lookup('GB_Test_Kit_Count', 'count', 'type', 'email')
Set @otdec = @ontrade-1
Set @emdec = @email-1

Set @update1 = UpdateData(
'GB_Test_Kit_Count',
1,
'type',
'ontrade',
'count',
@otdec
)

Set @update2 = UpdateData(
'GB_Test_Kit_Count',
1,
'type',
'email',
'count',
@emdec
)
]%%
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