Split Excel Cell that has a Formula in it
You may try FILTERXML()
=TRANSPOSE(FILTERXML(SUBSTITUTE(SUBSTITUTE(FORMULATEXT(A1),"=","<t><s>"),"+","</s><s>")&"</s></t>","//s"))
If your version of excel do not support dynamic array then try-
=FILTERXML(SUBSTITUTE(SUBSTITUTE(FORMULATEXT(A1),"=","<t><s>"),"+","</s><s>")&"</s></t>","//s[1]")
and for 2nd value-
=FILTERXML(SUBSTITUTE(SUBSTITUTE(FORMULATEXT(A1),"=","<t><s>"),"+","</s><s>")&"</s></t>","//s[2]")
You can do it like this (broken out) but someone may have a better answer ...
A1 = =100+200
B1 = =MID(FORMULATEXT(A1),2,100)
C1 = =LEFT(B1,FIND("+",B1) - 1)
D1 = =MID(B1,FIND("+",B1) + 1, 1000)
Throw data in a spreadsheet in those cells and check the result.