Here a sample solution you can modify
library(dplyr)
Data <- tibble::tribble(
~Acquiror.Full.Name, ~Acquirer.SIC, ~Acquiror.Datastream,
"Premier Asset Management Group PLC", 6282L, "26287A",
"Imperial dd", 7011L, "682812",
"Primary Health Properties PLC", 6512L, "870775",
"Dsv As", 4731L, "505651",
"Eurobank Ergasias SA", 6029L, "308696",
"Opus Global Nyrt", 1611L, "682856",
"Societe de la Tour Eiffel SA", 6531L, "936843",
"Hojgaard Holding A/S", 1541L, "539810",
"Poolia AB", 7361L, "698982",
"CYBG PLC", 6029L, "8898PW",
"Inypsa Informes Y Proyectos SA", 3679L, "685499",
"RELX PLC", 2721L, "901080",
"Vistula Group SA", 2311L, "142070",
"Endeavour Mining Corp", 1041L, "548378",
"YIT Oyj", 1531L, "142836",
"IP Group PLC", 6282L, "27886R",
"Midsona AB", 2099L, "698716",
"Avingtrans PLC", 3593L, "904710",
"John Wood Group PLC", 8711L, "258098",
"Standard Life PLC", 6282L, "36228U"
)
Data %>%
mutate(group = case_when(
Acquirer.SIC >= 100L & Acquirer.SIC <= 999L ~ "industry1",
Acquirer.SIC >= 2000L & Acquirer.SIC <= 2399L ~ "industry2",
TRUE ~ "GO"
))
#> # A tibble: 20 x 4
#> Acquiror.Full.Name Acquirer.SIC Acquiror.Datastream group
#> <chr> <int> <chr> <chr>
#> 1 Premier Asset Management Group PLC 6282 26287A GO
#> 2 Imperial dd 7011 682812 GO
#> 3 Primary Health Properties PLC 6512 870775 GO
#> 4 Dsv As 4731 505651 GO
#> 5 Eurobank Ergasias SA 6029 308696 GO
#> 6 Opus Global Nyrt 1611 682856 GO
#> 7 Societe de la Tour Eiffel SA 6531 936843 GO
#> 8 Hojgaard Holding A/S 1541 539810 GO
#> 9 Poolia AB 7361 698982 GO
#> 10 CYBG PLC 6029 8898PW GO
#> 11 Inypsa Informes Y Proyectos SA 3679 685499 GO
#> 12 RELX PLC 2721 901080 GO
#> 13 Vistula Group SA 2311 142070 industry2
#> 14 Endeavour Mining Corp 1041 548378 GO
#> 15 YIT Oyj 1531 142836 GO
#> 16 IP Group PLC 6282 27886R GO
#> 17 Midsona AB 2099 698716 industry2
#> 18 Avingtrans PLC 3593 904710 GO
#> 19 John Wood Group PLC 8711 258098 GO
#> 20 Standard Life PLC 6282 36228U GO
Created on 2020-10-25 by the reprex package (v0.3.0.9001)