Use the following trigger modifiers to apply a Stop Loss for a bet triggered from Excel:-

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Modifier	Description	Notes
SLn	Set a Stop Loss.	n represents the number of ticks to use.
SLn-S	Set a Sliding Stop Loss.	as above.
SLn-L	Set a Level Loss Stop Loss.	as above.
SLn-SL	Set a Level Loss Sliding Stop Loss.	as above.
SLn-L-SLCn	Set a Level Loss Stop Loss with Chase option.	first n represents the ticks to use and second n represents seconds to wait before chasing
SLn-SL-SLCn	Set a Level Loss Sliding Stop Loss with Chase Option.	as above.
SLnP	Set a percentage based Stop Loss.	n represents the percentage of the odds to be used.
SLnP-S	Set a percentage based Sliding Stop Loss.	as above.
SLnP-L	Set a percentage based Level Loss Stop Loss.	as above.
SLnP-SL	Set a percentage based Level Loss Sliding Stop Loss.	as above.
SLnP-L-SLCn	Set a percentage based Level Loss Stop Loss with Chase Option.	first n represents the percentage to use and second n represents seconds to wait before chasing
SLnP-SL-SLCn	Set a percentage based Level Loss Sliding Stop Loss with Chase Option.	as above.
SLFn	Set a fixed odds Stop Loss.	n represents the fixed odds to be used.
SLFn-S	Set a fixed odds Sliding Stop Loss.	as above.
SLFn-L	Set a fixed odds Level Loss Stop Loss.	as above.
SLFn-SL	Set a fixed odds Level Loss Sliding Stop Loss.	as above.
SLFn-L-SLCn	Set a fixed odds Level Loss Stop Loss with Chase Option.	first n represents the fixed odds to use and second n represents seconds to wait before chasing
SLFn-SL-SLCn	Set a fixed odds Level Loss Sliding Stop Loss with Chase Option.	as above.

A Stop Loss triggered from Excel works in the same way as if it had been manually set in the main program.

Please see the description here to understand how Betting Assistant handles Stop Loss.